MPN: 55CA601


  • Does not come with pistol grip and trigger group, so you won't waste money on parts that you will switch out
  • All parts meet or exceed Mil-Spec


  • Material: Steel
  • Finish: Black


  • AR-15


  • 1x Takedown Pin
  • 1x Receiver Pivot Pin
  • 2x Takedown Pin Detent
  • 2x Takedown Pin Detent Spring
  • 1x Bolt Catch
  • 1x Bolt Catch Plunger
  • 1x Bolt Catch Spring Pin
  • 1x Bolt Catch Spring
  • 1x Buffer Retainer
  • 1x Buffer Retainer Spring
  • 1x Magazine Catch
  • 1x Magazine Catch Spring
  • 1x Magazine Release Button
  • 1x Safety Selector
  • 1x Safety Selector Detent
  • 1x Safety Selector Detent Spring
  • 1x Hammer Pin
  • 1x Trigger Pin

Does NOT Include:

  • 1x A2 Pistol Grip
  • 1x Pistol Grip Screw and Washer
  • 1x Trigger
  • 1x Hammer
  • 1x Trigger Spring
  • 1x Hammer Springs
  • 1x Disconnect
  • 1x Disconnect Spring
  • 1x Trigger Guard and Roll Pin


You know, sometimes enough is enough. If this is your first AR-15 build, or you're not interested in dropping a couple thousand into that gun, then a CMMG builders kit could be your answer. The CMMG gun builder's lower parts kit includes the essential lower internal parts you need for your AR. They leave out the common parts that people most often target for an upgrade.

CMMG Gun Builder Lower Parts Kit Save You Money

Why should you get a CMMG gun builder's lower parts kit? Okay, that's a good question. Say you have your eye on that perfect pistol grip or trigger. Perhaps you already have them lying on your workbench. Then you're the ideal candidate to get a CMMG gun builders kit. But, of course, you're on a budget and demand the right combination of quality and affordability. And really, you're not going to use a standard A2 grip anymore. And you simply don't want any more Mil-Spec fire control components lying around in your spare parts bin.

About CMMG:

CMMG was created way back in 2002 in Boonville, Missouri. When a company has been around for over 20 years, you know they are doing something right. They have grown and improved over that time to deliver quality parts at competitive prices constantly. CMMG builds everything from the tiniest spring in your CMMG builder's kit to complete firearms with the same attention to detail and quality control. On top of that, every component in your CMMG gun builders kit carries a lifetime guarantee against defects in material and craftsmanship.

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Reviews (3)

  • Cmmg lower build kit.

    Posted by Kevin on 3rd Jul 2020

    Was really surprised at how well this kit works. The quality is really good and works with over 1200 rounds down range with it.. teamed it up with a dirty bird trigger. Wing tactical is great as always.

  • Quality Lower Parts

    Posted by Johnny on 12th Jun 2017

    I have used this kit for three builds now and like these parts a lot. They are quality parts and WT had them at a great price with fast shipping. Recommend these and will use them again.

  • Great Kit for custom builds

    Posted by on 12th Jul 2015

    I have had nothing but good experiences with these partial kits. They allow you to get the basic small parts you need for your lower at a great price and save some money towards other upgrades such as ergo pistol grips or higher quality triggers. I use these all the time custom AR builds. Wing tactical always has great, service, prices and fast shipping times. Always look forward to future purchases.

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