My Account

product categories

Site Information

CMMG AR-15 Lower Parts Kit with Bullet Button

  • CMMG AR-15 Lower Parts Kit with Bullet Button (55CA668)

CMMG AR-15 Lower Parts Kit with Bullet Button

Product Code:
Calculated at checkout
$84.95 $79.95
Out of Stock

Out of Stock

MPN: 55CA668


  • Takedown Pin
  • Receiver Pivot Pin
  • Takedown Pin Detent X 2
  • Takedown Pin Detent Spring X 2
  • Bolt Catch
  • Bolt Catch Plunger
  • Bolt Catch Spring Pin
  • Bolt Catch Spring
  • Buffer Retainer
  • Buffer Retainer Spring
  • Hammer
  • Trigger
  • Hammer Pin
  • Trigger Pin
  • Hammer Spring
  • Trigger Spring
  • Disconnect
  • Disconnect Spring
  • Magazine Catch
  • Magazine Catch Spring
  • Bullet Button
  • Bullet Button Nut
  • Trigger Guard Assembly
  • Trigger Guard Pivot Spring Pin
  • Safety Selector
  • Selector Detent
  • Selector Detent Spring
  • Pistol Grip
  • Lock Washer
  • Pistol Grip Screw

**Fits all Mil-Spec AR-15 / M4 lower receivers.


Whether it’s your first advanced build or you’re an experienced armorer, CMMG Lower Parts Kit is the easy way to complete your AR-15 lower receiver with quality internal parts you can count on. When you want to get your lower built with as little fuss as possible, this go-to kit will make your build a success.

One of the most tedious parts of building a new rifle is just ordering all of the small lower receiver internals. Not only do you have to track down all of the separate groups, but if you want to have a reliable firearm when you’re done, you can’t order just anything from just anybody. It used to seem like in order to get the best parts for your build every detent pin and spring had to come from a different manufacturer.

Problems with certain AR-15 parts were notorious. The industry tried to address them. Everyone concentrated on a different weak spot, but nobody offered a full set of lower internals that really dealt with them all. Thanks to the CMMG Lower Parts Kit that problem is history. CMMG has created a full kit of lower receiver internal parts, packaged them in separate color coded groups to streamline the assembly process and added a quality A2 pistol grip.

When you choose a CMMG Lower Parts Kit You get all of the AR-15 parts you need to complete a quality working lower receiver, just add the buttstock of your choice and you can breathe again. No more mental jigsaw puzzle and checklist of part numbers, making sure you get everything ordered. No digging in a box full of pins and springs to catch the right ones for the stage of build you’re in. Take the shipping box to your workbench and take out what you need, one neatly packaged group at a time. Assemble in record time. Spend your time at the range, not on the phone or at the workbench.

Write Review

This product hasn't received any reviews yet. Be the first to review this product!

Back to Top