Does anyone know the specs for diameter of the 2 pins and their corresponding holes in the receiver.  I have a take down pin that keeps slipping completely out of the receiver when I put my M&P 10 in my case for storage or transport and have it right side down in the case.

I could temporarily solve the issue by rotating the pluck foam 180 degrees  so the right side is up, but that is a band aid not a fix.

Mojo/Mark
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Vincent from "Collateral"
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Joined: 9/30/09
Location: Northern Nevada (Reno/Sparks)

Original Post

No detent?  The detent should be going into the slot on the side of the takedown pin.  Front pin or rear?

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

Mark

Swear allegiance to the flag Whatever flag they offer

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

Rear pin. I’ve always called  that one the take down pin and the front one the pivot pin.  I’m not sure what their true nomenclature is. I just call them by their functional names. 

Mojo/Mark
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Yo homey, is that my briefcase...?
Vincent from "Collateral"
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You want the good life, you break your back, you snap your fingers, you snap your neck... Prong/Demon Hunter
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Joined: 9/30/09
Location: Northern Nevada (Reno/Sparks)

GNX posted:

Just throwing this out there but Is the take down detent spring long enough to push detent pin into slot on takedown pin?

I’ll need to take a close look when I get home from work as the rifle is not in front of me now.  

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)

Agree with the above. Should not happen for any pin spec issues. It's the detent.

Have not seen any issues with the 10, but other M&P carbines have — occasionally — come from the factory with sub-optimal rear detent spring pressure but I am not sure /why/. Like if they assemble wrong or they use crap springs or what. 

You may have bumped into this issue. Should be easy to fix. 

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Joined: 19NOV2004   Location: Mission, Kansas

The front pivot pin and rear takedown pin are .250" in diameter.  They are wider than the pins for an AR15 type receiver, as the AR308 weapons type system has a wider receiver due to the bolt carrier assembly being larger in diameter.

Generally on most AR308 type lower receivers, the rear takedown pin spring and detent are located under the right side of the grip.  So if you back the grip out (The grip screw is up inside the grip), until the screw comes out, you can take the grip off.  Once the grip is off, you can access the spring and detent.

In this pic, the rear spring (closest to the back of the gun) is the rear takedown pin spring, and the front spring is for the safety selector.

CY6
Greg Sullivan "Sully"
SLR15 Rifles
TheDefensiveEdge.com
(763) 712-0123

Ok no spring tension on the detent for a very obvious reason....there’s no spring.  Now it’s entirely possible but no guarantee that I lost it. Already got a line on a freebie local to me. So I’ll be GTG shortly. 

Thanks all for the responses. 

 

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)

So now the questions become...

I know there’s a hole in the grip to retain/contain the spring for the safety.   Is there supposed to be one for the detent spring as well?  Because my MOE grip doesn’t have one which makes it almost impossible to install the grip without bending the crap out of the spring which leaves it with insufficient tension to keep the detent in its mating groove on the pin. The pin still just falls out. 

If there’s supposed to be a retaining hole in the grip how deep is it supposed to be?

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)

MOJONIXON posted:

So now the questions become...

I know there’s a hole in the grip to retain/contain the spring for the safety.   Is there supposed to be one for the detent spring as well?  Because my MOE grip doesn’t have one which makes it almost impossible to install the grip without bending the crap out of the spring which leaves it with insufficient tension to keep the detent in its mating groove on the pin. The pin still just falls out. 

If there’s supposed to be a retaining hole in the grip how deep is it supposed to be?

No, there is no hole in the grip for the rear takedown spring to sit in.  You have to carefully press the grip into place and screw it down without bending the spring.   What I generally do on both the safety selector spring and rear takedown spring is to simply compress the grip into place on the receiver, then insert the grip screw and tighten it down.

 

CY6
Greg Sullivan "Sully"
SLR15 Rifles
TheDefensiveEdge.com
(763) 712-0123

Thanks Sully. I will need to be more patient and less hasty. 

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)

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