Installing An AR-15 Lower Parts Kit

A classy 3D video animation from CMMG shows us how it’s done:

Do it asap and secure your membership in the AR-15 Builders Club.

The video makes some of the steps look easy as pie… when in reality it’s going to take you a few tries unless you’re a seasoned pro.

CMMG makes a lot of AR-15 related items.  You can check out their website РHERE



Jwhite March 12, 2012 at 01:08 pm

The detents are the hardest part. Every now and then when I go to replace something on my AR, I forget about the detents. The latest one was a BW-NoMar-QD plate from Tareinco. I went to install the butt plate and launched the buffer detent across the room… twice. Once while taking off the buffer tube, and the second when I was reinstalling the tube.


bigghoss March 12, 2012 at 02:25 pm

This would have been helpful two weeks ago when I did my first AR.


ozwald March 12, 2012 at 05:22 pm

did it say “bold catch?”


JonMac March 21, 2012 at 05:39 pm

As the saying goes, ‘fortune favours the bolt’.


Mike July 26, 2013 at 12:02 am

Great video! I just put my lower together and it was the perfect guide. I’m having issues with the pin that holds the bolt release and the pin that connects the trigger guard. Other than those two issues, I’m good to go. Thanks.


Judson February 4, 2014 at 12:00 pm

So much easier to assemble than I had imagined. I didn’t think it would be hard, but only took about an hour on my first try, so much less for subsequent builds.


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