Pistol cal AR-15 (9mm)

I got to shoot a local manufacturers AR9 a few weeks ago and the low recoil, mvb stock, and the upper had a 6.5 inch barrel.  Talking with surefire last week and they will have an adaptor for a HK MP5 mount and a AR-9mm mount early next year if testing is good to run a surefire ryder 9 on it.   I have bee wanting a mp5k for a long time but cost, parts, and mag cost were the factors.  Also my wife only really knows Glocks and M4s.  An AR9 would be useful but I see this more of a fun and rocking a suppressed 9mm around.

This version takes Glock mags and looks like the JP but with a mvb stock to make it more of a pdw.  Thoughts, I know its not optimal but...it does scratch an itch, has some kind of place, and I already have a 2 10.5 inch ARs a LWRCi and LMT so a small 9mm would be fun.  

http://www.jprifles.com/1.2.13_GMR-13.php

https://mvbindustries.com/product/arc-stock/  Here is the stock currently on it, I was wondering if the lwrci uciw stock would work with a blowback design.  

Original Post

I'm seriously thinking of building one also. I will probably use a Quarter Circle 10 lower (Glock mag compatible) and try to use mostly Colt parts for the other stuff. I was thinking something like a 5" ish barrel and have a longer rail that the suppressor is recessed into. Like you mine would be mostly for fun, so it is not really a priority right now. 

Is your LMT a MRP?  Spikes tactical used to make a 9mm barrel and bolt..... they are extremely rare right now since Spikes stopped making the 9mm, and 22lr. kits for the MRP.  I would love to find a 9mm barrel  for my LMT MRP. I found a 22lr barrel and bolt last year for 300 bucks used.  A 9mm barrel and bolt wold be the cheapest option, and would allow you to run the same optics you have on your 5.56.  

 

I personally never liked the 9mm in AR rifles. They always seemed like a giant afterthought.  IF I had a huge supply of Glock magazines and was buying a Glock compatible lower I would probably think differently and try one out.  

 

I personally went with CZ Scorpion for a 9mm PDW.  It is designed for that round and is currently being used by a couple of Nation's police/military forces.  Another option is the Sig MPX. It shares a lot of AR style controls, and can convert to 9mm or 40, but is pretty expensive and parts availability currently suck.  If I was going to Sig MPX money,  I would probably just buy a nice MP5 clone.

 

I really like 22lr. for a trainer AR for the wife.  It uses similar shaped magazines (so she can use the same magazine pouches), it's cheaper than 9mm, and it is a LOT quieter than 9mm suppressed (good for the neighbors).  

 

The dark horse option: buy a 300 blackout barrel for your LMT MRP ($350.00 bucks).  This gives you a subsonic round and the potential to also use supers.  If your LMT isn't an MRP, take a look at the BCM offerings.  I think the sale is currently $725.00 with a KMR handguard, BCG, and charging handle.  

The only thing my 9mm PDW does that 300blk doesn't do, is give me a subsonic round with greater expansion when using factory 147 grain hollow points.  For 300blk you would have to buy some exotic and EXPENSIVE Lehigh rounds to get the same level of expansion.  

 

 

I do mot have a MRP lmt.  It us their standard LMT upper.  I wish I did but its one of those things I did not look into back in the day of piston.  Just because at the time I had 2 lwrci's.

I am looking at moving full tilt back to the Glock for the next full years.  With twins due in 2.5 months and all that.  

My .22 trainer is a Sig 522.  Not the best in the way of the same as the AR but it is fun and does alot.  

I guess with having done some close in work with a mp5k-pdw and having just bought a Surefire Ryder 9 I started looking at all options.  

I own a Beretta CX4 in 9mm that I do not shoot much, bought it as a truck gun because I had 5 Beretta 92's at the time.  Its reliable but I cannot suppress it until spending about $700 in parts threading and all the work due to 922r requirements.  

I was thinking the CZ but mags, parts, and I know I will always buying glock mags and AR mags.

300blk I like it but now I have to spend alot in bulk ammo to get to where I want to be.  I am focused on buying .223 and 9mm right now due to the stupidity of well election season.

I recently built and SBR'd a NFA Glock lower. I was adverse to a 9mm AR with the plug.

I run Glocks and think that with these proprietary lowers it is a viable option. Bolts are abundant, barrels are around, it's a handy little PDW. I sold my Kel-tec Sub2k to build it. 3-lug adapter and an Octane 45k makes it even more attractive. I will still be getting a CZ SBR.

 Right now I am trying to figure out if a Vltor's A5 system and which buffer system will work on the 9mm AR.

---------------------------------- 'My lot in life is to serve, to the best of my ability. To know my life was not a waste, that in the end I can look back from the gates and know I did my best and that it was enough"

Space, work and holiday shopping is taking up all my time. I will try to get you some specs and a pic or two today.

---------------------------------- 'My lot in life is to serve, to the best of my ability. To know my life was not a waste, that in the end I can look back from the gates and know I did my best and that it was enough"

I just took a different route.  The Zenith/MKE MP5 pistols are built in Turkey on actual HK licensed tooling and I've always had a hard-on for one, despite certain drawbacks.  In anticipation of the run that has already started with the Dems doing their customary gun-ban blather, I "bit the bullet" and ordered one from Atlantic Firearms.  It arrived earlier this week and it is definitely a fun toy.  I'm registering it as an SBR and it will be my 9mm shoulder gun.  I started to do the math, calculating purchase of barrels, uppers, handguards, receivers, etc., and went directly to "fuck it, I'll buy the MP5"!  At the end of the day, it was going to end up costing me about the same and the HK has a better rep for reliability than the 9mm AR's.  Plus cool points and I didn't own an HK.  Bonus that it came with 3 mags and an optics mount.

-------------------------

Mark

Swear allegiance to the flag Whatever flag they offer

Never hint at what you really feel

Teach the children quietly For some day sons and daughters

Will rise up and fight while we stood still

 

Joined:  2/24/2003                          Location:  Nevada, USA

My 9mm AR15 is perhaps one of the most enjoyable and fun carbine that I currently own. It is a traditional COLT style with flat top.

Built it with mostly used parts and use a standard AR with unk brand mag well adapter, 9mm hammer and a used RRA BBL and BCG upper (which has a COLT pattern BCG.) Bought a new Aero precision Flat top upper without the F/A.

The used BCG had been neglected (read: RUST) so I ended up replacing all internals with COLT brand guts. (Firing pin, FP Spring, extractor, etc)

It uses COLT pattern mags. Bought the Metalform mags through Brownells and the thing runs like a swiss watch.

Feeds all ammo. I have some +P and +P+ Federal that I want to Chrono for fun.

"Without training they lack knowlege, without knowlege they lack discipline , without discipline they lack victory"

 

“Go as hard as you can, for as long as you can, and then quit.”

 

Joined: October 2, 2007

I've been in the exact same boat.

I've wanted a pistol caliber carbine of some kind.  Ideally, it would be a .45ACP, but nobody currently makes one I like for a price I'm willing to pay.

A buddy of mine has an SBR set up pretty similarly to the post above me, and it is just plain fun to shoot.  Currently, living a couple miles from Montana Gold bullets, and being able to buy seconds for $60/1000, I can reload 9mm for 10 cents around, so can shoot these things pretty guilt free all day.  I ended up going with the CZ Scorpion, however; it is at my local manufacturer, in NFA jail, waiting on the paperwork; I didn't want to take it home before it was a functional gun.  The mags were a concern, I just bit the bullet, and bought 20 extra mags with the gun ($20 a piece right now, lord knows in another year).  I went with the Scorpion because I've wanted one since they came out, and I fear at the minimum some sort of import restrictions will be forthcoming, and an imported weapon full of 'evil' features is pretty low hanging fruit.

Back to the topic.  I think it does have its place as a suppressed, subsonic weapon.  With proper bullets designed to expand at the velocity you're launching them.  Mine will very likely become my wifes bedstand gun.  It will have zero recoil, minimal noise, and even with the red dot, white light, and 30 rd magazine will still be light and handy.  I think my OAL of the barrel with the suppressor will be somewhere in the neighborhood of 13." 

 

If you want it even a little bit, and can get it for a price that you can live with, I would jump on it.  I think this coming year is going to be a mess with legislation....

________________________________________________________

Some will die in hot pursuit in fiery auto crashes

Some will die in hot pursuit while sifting through my ashes

And some will fall in love with life and drink it from a fountain

That is pouring like an avalanche, coming down the mountain

 

Joined: June 2011

Location:  Kalispell, MT

SBR or pistol? Small distinction, but $200 extra in price, wait time, etc.

Generally, two ways most people go - dedicated block, like the Hahn, Colt SMG mags, 9mm upper. Other route is the Quarter Circle designed around Glock mags, which have been getting rave reviews and are really priced competitively for a dedicated lower. I would expect you'd still see slightly better reliability of the true double stack Colt SMG mags, as opposed to tapered Glock mags, but interchangeability, convenience, and all that isn't a trivial concern.

 

I've been pondering this, 9mm offers some benefits in the form of cheap ammo, but .45 is an awesome suppressed option. The Quarter Circle large frame lowers look ripe for some interesting builds.

 

You could also watch for sales post Christmas, RRA has some great uppers and all you need is to pick up some mags and the lower block.

 

Obviously Scorpion gets you a lot of the same functionality at a good price, same as Sig MPX, minus the good price. BT has some good offerings coming online, and if the PCC craze really takes off, I think you'll see a lot of new companies stepping in. I'd love to see what SW or Ruger could do in this space, as long as it was AR based. My feeling is if you don't have to have it now, there could be a whole bunch of great new options introduced at SHOT. This, suppressor capable, and budget precision are my bet for where development goes this next year.

You can also look at Lone Wolf for 9mm ARs  https://www.lonewolfdist.com/Products.aspx?CAT=2895.  They are branching out of the 9mm arena, so maybe they'll offer .45 some time in the future.  I bought a pistol lower a while ago; still  trying to figure out the upper I want with it (what barrel length I want? what "rail" I want? etc.) .  From the lower, the quality actually seems pretty good.  I've bought SOME Glock stick mags, I should probably buy more while the buying is good.  I always saw this as a good "truck gun",  but also a good  "AR" for my wife.  While I'll never see a 9mm as replacing a 5.56 or even  a .300,  I do see it as a viable option when you can't go full size.


If it's a Pain in the Ass....you're doing it WRONG

I don't make policy, only suggestions, take them as such.

 

Joined: 8/5/05    Location: 20 miles west of Gettysburg, PA

 

 

AR Specs

- New Frontier Armory Spartan 9 Glock lower. I handled one of these and then a QC10 lower. I liked the fit and feel or the NFA lower over the QC10. The QC10 has the last round bolt hold open built into the lower (and I have heard it can be hit or miss). NFA has their bolt hold open built into their upper if that's your thing.

- QC10 7.5" barrel with HK Three lug adapter

- NFA's modular BCG, thinking I should of gone with their normal BCG so I can use a JP capture 9mm buffer and spring.

- Aero COP Carbine upper

- BCM/Magpul Furniture goodness

- MBUS Pro's

- Magpul padded sling w/QD points

I like the 9mm AR set up because it's the same Manual of Arms as what I have trained on. Also, the 9mm AR takes standard AR parts (except the proprietary lower parts which I ordered an extra set of). The 9mm lowers take a  standard FCG, pins, etc and I like the threaded bolt catch pin and rear detent pin is a plus.

I mocked up the build, no FCH/BCG in it PM me for more info.

A few pics of the barrel with device

---------------------------------- 'My lot in life is to serve, to the best of my ability. To know my life was not a waste, that in the end I can look back from the gates and know I did my best and that it was enough"

Spacetaco posted:

Here is the one I am looking at.  This is a factory built SBR

The 9 AR. I am looking at.

 

Question folks, I was thinking of putting Fixed Irons on the AR Pistol since I need to send my aimpoint micro and see if they will fix it with m stupidity of striping a screw.  

 

What sight options for fixed sights would be good for this short of barrel if I don't keep the micros on there?  The plan is the micros on there now will go to my Beretta ARX-100 I bought as a deployment gift.  

If Ruger brought back the PC9, with a few rails, better trigger and Glock mags, they'd probably sell a hell of a lot of them in ban states.

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So low speed, i'm in Park.

"I could stand to hear a little more.." Jayne

Training is brief. Death is forever. PAY ATTENTION.

Joined: 6/14/03 1:02 PM

MrMurphy posted:

If Ruger brought back the PC9, with a few rails, better trigger and Glock mags, they'd probably sell a hell of a lot of them in ban states.

Ruger wouldn't need any of those upgrades to sell em in the ban states....that's for sure...

If they just brought them back people would snatch them up...I would...even if they took ruger pistol mags

Since this thread got resurrected: I have an SBR'd AR. I got rid of my 9 mm carbines years ago, but now IDPA has a Pistol Caliber Carbine class, so I can bring a "rifle" to those, and get some action shooting practice when that happens, so it seems worth getting one again. Instead of a new gun and paper, I'd like a mag block and short (10.5?) upper to simply clip onto my normal rifle. 

IS THERE a good mag block for 5.56 lowers? I am unclear on this when I research it, and don't know anyone with one now. 

Who makes the best uppers? Why doesn't BCM make a 9mm, dammit? 

The things that will destroy America are prosperity at any price, peace at any price, safety first instead of duty first, the love of soft living and the get rich quick theory of life. – Theodore Roosevelt

 

Joined: 19NOV2004   Location: Mission, Kansas

For those interested Midway has had the Glock 33 round 9MM mags on sale for $24.99 for a couple of weeks running. Showing as "available" this A.M.

Mojo/Mark
__________________________
Yo homey, is that my briefcase...?
Vincent from "Collateral"
__________________________
You want the good life, you break your back, you snap your fingers, you snap your neck... Prong/Demon Hunter
__________________________

Because...I Can. 


Joined: 9/30/09
Location: Northern Nevada (Reno/Sparks)

shoobe01 posted:

Since this thread got resurrected: I have an SBR'd AR. I got rid of my 9 mm carbines years ago, but now IDPA has a Pistol Caliber Carbine class, so I can bring a "rifle" to those, and get some action shooting practice when that happens, so it seems worth getting one again. Instead of a new gun and paper, I'd like a mag block and short (10.5?) upper to simply clip onto my normal rifle. 

IS THERE a good mag block for 5.56 lowers? I am unclear on this when I research it, and don't know anyone with one now. 

Who makes the best uppers? Why doesn't BCM make a 9mm, dammit? 

I know this isn't a gaymer site but this is why I want a 9mm carbine too. The updated rules are no longer restricted to >10"  barrels so that opens up MP5s, Uzi, SBR Skorpion Evos and (locally very available) pistol-carbine conversions like Hera and Roni, locally the cost of those last two is prohibitive, they are like 1/3 the price of a 9mm AR.

 

Sourcing a Glock mag lower here looks impossible   so we are stuck with a locally made DM4 in 9mm or a Stag 9mm. The Stags use blocks and IIRC Colt SMG mags in a standard lower. 

The DM4 uses a block too, but getting any info on parts from them is rather hard. 

"Run by duffers.....they tend to amplify mistakes." " It a very cool, very fun, very awesome piece of shit."

 

Location Cape Town, South Africa

 

Responding a month later as I sold the never-used M70B2, so re-invested the money into this, which just arrived:  

I don't strictly use IDPA for gaming, but as confirmation of my otherwise-trained skills, and as practice, as we have a lot of walls and doors, so it's a real good place to do cornering and so on. Monthly! We're usually indoors, so can turn off the lights, so trying to get them back into regular low-light, also. 

Our club is going to be a little weird on the PCC class (safety worries, mostly), so they won't be allowed every month, but a couple-three times a year. Still, worth having I think. And maybe they will start allowing it generally, and I can then get monthly close-quarters carbine practice in. 

It's a bit cheap, in that it has a shitty setscrew FSB...

and a forward-assist + shell deflector upper...

but it has all the parts I need in one box, and a ramped bolt. With a 4 pack of NIW mags (so now 6 total!) I am under $500 invested, which is a hell of a deal compared to the complete guns I was looking at. And we all know ARs. If I fall in love, I can change the receiver, get the gas block, replace the FSB, et al. 

Once zeroed and I confirm the FSB isn't canted, I'll run it as it is for a bit to be all amusingly old school. But sometime I need to get a gooseneck, a dot and light to make it more like my 5.56 carbines. 

Kayback posted:
shoobe01 posted:

 

...

...this is why I want a 9mm carbine too. The updated rules are no longer restricted to >10"  barrels...

When did this happen? Have a link? As none of our club seems to know this, and the IDPA rulebook online doesn't show under 10" being allowed.

 

 

P.S. mods, this not-unrelated thread of useful info is still off in Carbines and Rifles: https://www.lightfighter.net/t...40#47474438023815040 Should be, as the last post there says, moved.  

The things that will destroy America are prosperity at any price, peace at any price, safety first instead of duty first, the love of soft living and the get rich quick theory of life. – Theodore Roosevelt

 

Joined: 19NOV2004   Location: Mission, Kansas

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I bought a Colt R6430 9mm carbine back in 1992. For $650. At that time some of the local departments were using Colt & Marlin & Ruger carbines as replacements for or in addition to shotguns.  From about 1998 on everybody went to "real" AR-15 pattern guns.

I use the Colt 9mm frequently as a practice gun. I can use it on indoor ranges that are restricted to pistol calibers only, I can shoot it on steel plates without specialty ammo, and the manual-of-arms is the same as all the other AR pattern guns I already own or that ride in my squad car.

And USPSA and IDPA both have PCC divisions now and I am classified in both. If you set up your AR 9mm carbine basically the same way you set up your "real" AR, then the 9mm works good as a sub-caliber trainer.

I bought a half dozen more Colt pattern mags from Palmetto State Armory a year ago last spring and they have worked really well.

**********************

arm yourself, because no one else here will save you . . .

 

he found faith in danger, a lifestyle he lived by

 

Assemble the Kingsmen

There's a certain zen idealism to not being that successful at my business. I got caught up, had nothing really urgent to do this afternoon, so just blew off work and went to the range. 9 mm upper day!

Worked flawlessly. Not a stoppage at all with any mag, locks back every time. Is really hard to insert loaded mags on a forward bolt, and really hard to run the bolt on a loaded mag. Huh.

Oh, this is somewhat shocking because I have the cheap plastic mag block, and even modified to be bottom load so it has no real retention, but friction and it works fine. 

Oh, it was sketchy retaining mags, so I switched to a "9mm" mag latch. Which I just switched to. Works fine for 5.56 also. Just different grind so it engages deeper, but there's an awful big lump on 5.56 mags so it should be fine. 

It's been a minute since I had my HK94 clone, or my Calico, so I was expecting quieter. Maybe it's the 10.5" barrel, but it's a bit stout. Well... I thought. Luckily I shot the 5.56 upper at the end of the day to re-set my brain IT IS MUCH LOUDER. But recoil is basically the same, so that's nice for training value. 

Wasn't zeroed, despite being used. I assume this is proof no one shoots: I never get used guns or uppers that are zeroed. Idiots. Anyway, despite looking twisted, it's not so far off I couldn't get it zeroed. 

 
My cheapass 115 practice ammo suuuucks. Every fifth round makes a weirdly different noise. I switched to the much nicer 124s I just got and they were good. But, not the gun. 
Ejects the /exact/ same place as the 5.56 upper does. Little 3 foot diameter pile of both at the end of the day. 
 
Questions:
  • Do I need to worry about buffer, spacer, anything if it seems to run fine? Lots of internet commandos spread info about them battering and stuff but is that true? 
  • Where do you zero 9mm carbines/SMGs? I did 25 yds as that's max range for at least the club range, where I will likely use it, so I can sortsa simulate "far away" and aim dead on, account for offset shorter 

The things that will destroy America are prosperity at any price, peace at any price, safety first instead of duty first, the love of soft living and the get rich quick theory of life. – Theodore Roosevelt

 

Joined: 19NOV2004   Location: Mission, Kansas

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Also, mag carriers. I got rid of all my 9mm SMG sorts of stuff long ago, so had to buy something, and elected for a double 10-speed in belt config. Partly as it was suggested in some other carry thread recently. It's nice. 

Harder to insert the mags than a single stack, or 10-speed rifle pouches, but holds these very long sticks real well. 

I might even try them if I had to conceal under e.g. a suit jacket all day. They feel that stable and secure. 

What's everyone else using? 

The things that will destroy America are prosperity at any price, peace at any price, safety first instead of duty first, the love of soft living and the get rich quick theory of life. – Theodore Roosevelt

 

Joined: 19NOV2004   Location: Mission, Kansas

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Just finished my AR9 pistol build,

 

Rainier arms upper receiver

Aero Precision 9" Mlok handguard

8.5" faxon barrel with KVP linear comp

Faxion 9mm BCG

spikes pistol buffer and springco red spring

Spikes 9mm Glock mag lower,

Upper and Lower small parts from my parts bin

SB Brace

 

 Haven't had a chance to shoot it yet, I was planning going to go to the local indoor Fudd range yesterday, but messed up my shoulder. 

AR9

It looks awesome. I'd be terrified of shooting my finger off. 

The things that will destroy America are prosperity at any price, peace at any price, safety first instead of duty first, the love of soft living and the get rich quick theory of life. – Theodore Roosevelt

 

Joined: 19NOV2004   Location: Mission, Kansas

"I'd be terrified of shooting my finger off."

Be very afraid. Circa 1995-6, the FBI Director got tough with all senior supervisors from HQ and made them requal with all Bureau weapons. A SSA I worked with, a senior FCI supervisor went to Quantico and shot. Handgun went well, on an HK MP5 he shot the end of his left index finger off. 

I imagine he hurt like hell, but the shock also did damage to his hand and arm, he had an external brace (lay term, I'm sure it has a fancy med term) with bolts going into the arm up the forearm.  So in addition to what I'm sure was an umcomplimentary nick-name in HQ, he was seriously injured.   Go figure. 

-----------------------------------------------------------------------

“Speak softly and carry a big stick;  you will go far. “

 Theodore Roosevelt

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Joined: 29 May 2008          Location: AZ

shoobe01 posted:

It looks awesome. I'd be terrified of shooting my finger off. 

Thanks, I do kinda wish I went with a flat sided upper, but I'd picked up the rainier on sale a while ago. There's enough stuff at the front of the gun that you have a good idea where your hand is relative to the end of the tube and am not super worried about it eating fingers, That being said I do have a hand stop on order. 

My COLT factory 9mm is keeping the 16" barrel for now but it is pretty straightforward with Magpul furniture, Gunfighter charging hable and nib MRO I picked up for $300. Needs a light and maybe KNS FCG pins

Runs like a raped ape and I found a case of old school Federal Hydrashok 9mm +p and +p+ from when we carried MP5's cant wait to try those out with the 16" barrel

Maybe will SBR it at some point give my overall price point in its current configuration is under $1000 im happy with it.

 

"Without training they lack knowlege, without knowlege they lack discipline , without discipline they lack victory"

 

“Go as hard as you can, for as long as you can, and then quit.”

 

Joined: October 2, 2007

shoobe01 posted:

Worked flawlessly. Not a stoppage at all with any mag, locks back every time. Is really hard to insert loaded mags on a forward bolt, and really hard to run the bolt on a loaded mag. Huh.

...

But recoil is basically the same, so that's nice for training value. 

My biggest issue when I used to shoot a Colt SMG a bunch was not feeling that it was in lock-back or rather that it DID NOT go back into battery.  For whatever reason, the full cycle (or lack there of) of a .223/5.56 bolt was/is so much easier for me to distinctly feel.

Have you run it hard yet?  I’m curious if you’ve noticed the difference and missed a lock-back when running it under any type of stress.

-----------------------------------

What is left when honor is lost?

Nothing like real stress. Just range time. Some running about to various ranges, shoot on the move etc. but no one watching, someone else's COF. 

It is a bit weird feeling under recoil just at that point. Much more reminiscent of a 9mm SMG than I expected (or recalled from the distant past). Weird, huh? 

The things that will destroy America are prosperity at any price, peace at any price, safety first instead of duty first, the love of soft living and the get rich quick theory of life. – Theodore Roosevelt

 

Joined: 19NOV2004   Location: Mission, Kansas

shoobe01 posted:

It is a bit weird feeling under recoil just at that point. Much more reminiscent of a 9mm SMG than I expected (or recalled from the distant past). Weird, huh? 

For as much as the platforms are similar, it is odd when you pick up on the differences in bolt cycles. 

I’m curious to hear your impressions if/when you shoot it in a match. 

-----------------------------------

What is left when honor is lost?

TheTick posted:
shoobe01 posted:

Worked flawlessly. Not a stoppage at all with any mag, locks back every time. Is really hard to insert loaded mags on a forward bolt, and really hard to run the bolt on a loaded mag. Huh.

...

But recoil is basically the same, so that's nice for training value. 

My biggest issue when I used to shoot a Colt SMG a bunch was not feeling that it was in lock-back or rather that it DID NOT go back into battery.  For whatever reason, the full cycle (or lack there of) of a .223/5.56 bolt was/is so much easier for me to distinctly feel.

Have you run it hard yet?  I’m curious if you’ve noticed the difference and missed a lock-back when running it under any type of stress.

I know exactly what you mean, I frequently can't tell where my 5.56 Tavor's bolt is because the recoil impulse feels so different from an AR.

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