CMMG Complete AR-15 Lower Receiver Parts Kit

Manufactured by CMMG
Manufactured by CMMG
139 Reviews

In Stock

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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.
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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

6.8 spc build


I am very happy with the CMMG floor parts kit that I bought for my AR build. All the parts were in separate color-coded bags for ease-of-use.

Excellent service from PA

by for the kit. Excellent machining, roll pins were beveled which is nice, takedown pins were slightly longer than most milspec with indentions on the ends. Really kit had two bolt catch pins...and no bolt catch plunger. Sonofabitch. So, my build came to a halt. $1.49 for a plunger, and $7.01 s/h (since standard USPS is "running 3 weeks behind" and I don't want to keep dragging this build on) kinda leaves a bad taste in my mouth for CMMG even though the LPK is nice.

High quality LPK


After owning factory assembled AR, I purchased the CMMG LPK for my first AR build. This LPK does not disappoint. All parts were high quality and accounted for. The separation of parts into groups, in color coded pouches, not only simplifies assembly, it helps you stay organized. I will definitely purchase this LPK for my next build. Thank you CMMG and Primary Arms.

my first build


all the parts fit perfect on the lower very fast shipping i will buy more of these parts for my next build

All the parts


All the parts you need and color coded for ease of use. What more can you ask for?!



Amazing. Will always do business with Primary Arms.

Extremely fast to ship as always.


Another good deal and great transaction from Primary Arms!

CMMG always does it RIGHT!


As ALWAYS, CMMG offers some of the best items and of course, PRIMARY ensures we get it at THE BEST PRICE and FAAAAAST SHIPPING!I have continued to use CMMG parts, UPPERS and enjoy their customer service for YEARS! With MANY great brands out, I get VERY GOOD quality and run this stuff every bit as much as I run my 'Veske, Knights and the others COUNT ON for a rifle that I USE! SURE, you can not clean them as much, put anything thru them, set them up for light, or heavy duty, and NEVER worry about performance.I build and assemble all of my rifles using and maintaining with TW-25B and KNOW that a lot of it comes from knowledge and proper maintenance. SO WHY BUY CHEAP brands, when you can buy great brands with the best prices and count on them when the engagement and threat is REAL!Thanks AGAIN, primary!

Another LPK, yawn


As expected, nothing great or sub-par. Nice packaging / arrangement. Only comment is this trigger group probably has the most travel of any milspec trigger I've put together.

CMMG Lower Receiver Parts Kit LPK for AR-15 CMMG55


as usual CMMG makes life easier for DIY's.