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Reply to "Pistol cal AR-15 (9mm)"

Okay, time to admit I like RDS, and the pistol carbine should be an emulation of my 5.56 guns instead of something amusingly retro. Flat top, and a 7" alpha rail.  

Since mine is pretty cheap, it only looks like a Colt at a distance, but runs like a top, I am gonna take it apart so I keep the bolt and barrel and so on. 

Questions: 

  • If I don't need a fixed front sight, I can just not put the FSB back, right? No gas system so it doesn't do anything but be a sight right? 
  • I am gonna do the gas diverter and half-sized dustcover. Since it will be random clutter, does anyone make a truly slick sided (no fwd assist, no brass deflector) upper with a pic rail? 
  • Do I need to time the barrel nut as though it has a gas tube passing through, or just tighten to the specified torque and not worry about where exactly it ends up? 
  • Anything else tricky to assemble a "subgun" upper I haven't though about? 
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