CMMG Complete AR-15 Lower Receiver Parts Kit

Manufactured by CMMG
Manufactured by CMMG
139 Reviews

In Stock

Orders of non-FFL items will ship same-day if placed before 3:30pm CST (M-F). FFL orders will ship within 5 business days if transfer details are provided.

For individual Officer, First Responder, and Military pricing please make sure you are logged in. for details



CMMG Lower Parts Kit for AR-15. Includes pistol grip, fire controls, springs, and pins necessary to complete stripped lower. All AR15 Lower Parts Kits now come in color coded pouches to aid in assembly.
See More


Weight7 Oz
California Prop 65 warning

 WARNING: This product can expose you to chemicals, which are known to the State of California to cause Cancer and Reproductive Harm. For more information go to



This is a good lower parts kit for the money. As always Primary Arms has great customer service and really fast shipping. I always look forward to doing business with them.

Great LPK


This is a great lower parts kit. I particularly appreciate the color coded packaging. Components are grouped by color - very convenient.Primary Arms service was excellent, as always.

Basic but great stuff


This kit has a few individual color bags and a paper telling you what color bag has what making it easy on newbies like myselfEverything fit and went on easilyTrigger is nice and smooth The grip has a cheap feel to it so didn't use itOther than that great parts kit

Poor Quality


Used this for a build. Poor quality at best. The parts were poorly finished/coated, and extremely inconsistent, and the takedown pins were rusty. I'm not just talking about a little surface rust that can be wiped off. I contacted CMMG, and they didn't even reply. Spend a few more bucks and get a better parts kit. Spikes was higher quality.

Very Good Trigger


Used this with a Anderson lower. Fit was very good and the trigger is excellent for a basic AR trigger, I figure its about 6lbs and crisp. Much better than my brothers DPMS I would recommend it. Only thing I would like to change is the trigger guard. its just an a2 style straight gaurd. May switch to a magpul at somepoint

Nice Quality Kit


Very nice LPK. Individual bags really help believe it or not. Hard to tell one Lil spring or pin from the other sometimes even if you know what your looking at. Trigger feels nice, it's a solid crisp GI trigger. I think if you want much better In a trigger your going to have to spend quite a bit more. Grip (while just as good a quality as anyone else's) is simply a stock style grip and leaves me wanting a nice magpul grip. The rest of the parts are great. Don't much like the trigger and hammer pins but, same as the grip, they are as good as anyone else's i just prefer aftermarket pins. It's surely one of the best kits in its price range. Primary Arms Shipping as usual - Fast and on PointThanks

Review of parts ordering


Very pleased with the experience. It was easy to place the order and excellent response by Primary Arms in shipping the items to me.

waiting on lower


Waiting to put into lower, but heard good things. Colored packages will make assembly even easier.

Just as expexted


What can I say, it's a lower parts kit. I'm familiar with cmmg, and knew what to expect. A good kit, at a good price.

complete lower kit


With the exception of the buffer tube buffer and spring all the parts you need for your lower in conveniently marked bags