Modern Sporter builds Q&A

[Unhinged]

use the tool you bought ignore weird internet neck bearding

[upinsmokeweldinginc]

Anyone else having a problem with the magpul pistol grip screw bottoming out on the lower and not being able to tighten it down

[greg olmstead]

Anyone else having a problem with the magpul pistol grip screw bottoming out on the lower and not being able to tighten it down

This was disclosed a few months ago. Cut the screw with a hacksaw or similar device or use a washer. I used a 1/4 lock washer.

[Dietz]

So I did have one hiccup. The top rail seems to be a bit narrow....optics bolted up fine, but I had to squeeze the piss out of my BUIS to get it to lock in. There are three threads out the end vs flush to 1 thread on all the other rails I've tried.

Crap. That's not good. What backup sight is it?

[purplezuk]

Grease the threads, as well as a bit where the barrel nut contacts the barrel extension. Torque to spec. I just built 5 on Thursday with a reaction rod, nothing to worry about

[ThatM305Guy]

Crap. That's not good. What backup sight is it?

FAB defense. If it wasnt polymer I dont think i would have been able to tighten it down without it rattling around loose.

[QuickDraw16]

Basically the same as a typical AR build, except for the rear takedown pin and trigger guard/pin that come with most lower parts kits (LPKs) and the one little c-clip that attaches to the dust cover rod.

A good place to start reading:

google "definitive-guide-building-ar-15" I couldn't post the link directly but that cheaper than dirt article s a good quick read with lots of handy links.

How is the dust cover pin retained without the c clip?

[johnmbrowning]

How is the dust cover pin retained without the c clip?

Mine is retained by the barrel nut of my handguard

[rimlick]

Are the strike industries dust covers recommended? It's funny enough my last part of my build I haven't bought. Anyone ran these plastic ones yet?

[apex survival]

Are the strike industries dust covers recommended? It's funny enough my last part of my build I haven't bought. Anyone ran these plastic ones yet?

I put one on my upper. Easy to install and quiet when it pops open. It's fairly thick so easy to manually open when your on a stand and ole wiley is coming in.