CMC Triggers AR-15 Lower Parts Kit - No Fire Control Group or Grip

Manufactured by CMC Triggers
SKU: 81500
MPN: 81500
Manufactured by CMC Triggers
19 Reviews
Add to cart for sale price $29.99 $39.99

In Stock

Standard orders will ship out in 1 business days or less if ordered by 3:30 pm CST, Monday-Friday. FFL orders will ship within 5 business days or less as long as we have the information for the transfer destination. NFA items will take longer to ship and are dependent upon ATF processing times.

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With roots in aerospace manufacturing, CMC is perhaps best known as the producer of the original drop-in precision trigger for the AR-15/10 platform. CMC Triggers are dedicated to crafting the finest parts and accessories for law enforcement, our military, and civilian use.

The AR Lower Assembly Kit contains MIL-SPEC components, perfect for your next AR-15 build or keep one on hand for spare parts.

100% Manufacturers Lifetime Warranty!

NOTE: Fire control group and pistol grip not included.

Kit includes:
  • (1) Bolt catch
  • (1) Bolt catch plunger
  • (1) Bolt catch roll pin
  • (1) Bolt catch spring
  • (1) Buffer retainer
  • (1) Buffer retainer spring
  • (1) Magazine catch
  • (1) Magazine release button
  • (1) Magazine catch spring
  • (1) Standard safety selector
  • (1) Safety selector detent spring
  • (1) Safety selector detent
  • (1) Takedown pin
  • (1) Pivot pin
  • (2) Takedown/pivot pin detents
  • (2) Takedown/pivot pin springs
  • (1) Trigger guard
  • (1) Trigger guard roll pin
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BrandCMC Triggers
Weight3.2 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

Looks good to me


Received my order 12/7/20 and because of other reviews I checked trigger guard and it is aluminum and fit an Anderson lower just fine. Haven't installed the rest of the parts yet but they look standard.

Bought another one after the first.


I had two Noveske N4 lowers that needed building out. The parts kit worked great and the trigger guard was a curved aluminum without any logo. Looks great and works great!

Great parts


Everything went together nicely. Aluminum trigger guard was packed although I have integral trigger guard built into the lower. All parts fit perfect.

Not the same trigger guard

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Plastic "winter" trigger guard with an allen set-screw instead of a spring loaded pin as pictured. The guard isn't even threaded for the screw, however the allen key is included. The rest of the parts are a fine quality with a shiny finish and don't come scratched like an aero kit does... Buyer be aware the trigger guard picture is not what comes with this kit.
<br>It was nice speaking to you on this issue and getting that cleared up. Please let us know if you need assistance with anything else.

Safety selector detent To big

by -

Safety selector detent Was to big . Everything else worked .
<br>We are happy we could help you on this and will be sending that out shortly per our conversation. Please let us know if we may help you with anything else.

Great kit

by -

All parts look well made and fit well. If I catch these on sale again, I'll get a couple just for spares. Good stuff. I've never seen a LPK packed in a neat little cardboard box like this one.

Came through in the pandemic!

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So I was laying in bed with Covid pneumonia, while I got an email on the deal PA had for these cmc parts kit. I’ve just purchased the cmc flatty so I grabbed it I should have grabbed 4 but live and learn. The finish on the parts were perfect seemed like nitrated. The take down pins slide right in, springs straight, and most off all mag catch and roll pin went together so easily! From now on on general builds this parts kit my go to!

Just what I needed

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A nice quality kit. I love the trigger guard upgrade, unlike some previous reviewers. Its very similar to a Magpul trigger guard which I was going to upgrade to anyway like many many other Americans have. I caught this on sale which made the deal even sweeter. Thanks once again Primary Arms.
<br>We are happy to have provided you with a great product at a great price.

Just one thing…


Good fit and finish for all of the parts. I just wish we could do away with the standard trigger guard.