Fall Build Fest Continues - 15% OFF GUN PARTS THIS WEEK
Use Code: PARTS15

Fall Build Fest Continues - 15% OFF GUN PARTS THIS WEEK
Use Code: PARTS15

GUNBUILDER'S LOWER PARTS KIT FOR AR-15 LOWER

GUNBUILDER'S LOWER PARTS KIT FOR AR-15 LOWER Reviews & Ratings

CMMG® Lower Parts Gunbuilder's Kits contain the needed parts to complete an AR-15 lower receiver. These kits come less the trigger, grip and trigger guard.

INCLUDES:
  • Takedown pin
  • Receiver pivot pin
  • Takedown pin detent (2)
  • Takedown pin detent spring (2)
  • Hammer and trigger pin (2)
  • Safety selector
  • Selector detent
  • Magazine catch
  • Magazine catch spring
  • Magazine release button
  • bolt catch
  • Bolt catch plunger
  • Bolt catch spring
  • Bolt catch spring pin
  • Buffer retainer
  • Buffer retainer spring

See all of our AR15s and AR15 parts here.

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Reviews Summary
Customers consistently appreciate the GUNBUILDER'S LOWER PARTS KIT for its quality, ease of installation, and organized packaging. Many highlight its value without unnecessary components. However, some have reported issues with specific parts like the safety selector and fitment on certain lowers. Overall, it's a reliable choice for those customizing their AR builds.
What Reviewers Are Saying
Product Quality
82%
The quality of the parts is consistently praised across reviews. Many users find the machining and finish excellent, noting that the parts function smoothly and fit well in various lower receivers. However, a few reports indicated problems with specific parts, such as the safety selector not meeting expectations.
Organization and Packaging
75%
Reviewers commend the organized packaging of the kit, which includes labeled compartments, making assembly much easier. This thoughtful packaging helps prevent mix-ups and assists beginners, enhancing the overall building experience.
Customization Flexibility
68%
Many users appreciate that the kit omits components they may not need, such as grips and triggers, allowing for a more personalized build. This flexibility is a significant advantage for experienced builders looking to select their preferred parts.
Ease of Installation
71%
The installation of parts is generally described as straightforward, with reviews noting that the fit is tight yet manageable. Users have shared positive experiences with assembly, aided by the clear part labeling and organized layout.
Value for Money
70%
A significant number of reviews highlight the kit as a cost-effective option, providing high-quality parts at a reasonable price. Many customers have compared it favorably against other kits, feeling it delivers robust performance without extraneous costs.
Occasional Quality Control Issues
16%
Though many reviews are positive, a few customers reported specific quality control issues, particularly with individual parts like the safety selector or inconsistent fitment. This indicates that while the overall product quality is high, there may be occasional variations.
1
Not just a lemon.
I purchased 2 CMMG lower parts kits from different vendors. I have found in my kits, there is something wrong with the safety selector. I think it is a junk detent plunger, because whatever coating/Plating they use, immediately flakes off. It could be the spring they supply applies too much tension. The machining or casting on the selector where the detent rides, also seems rough. I tried both selectors and both had same problem. Selector required more effort to operated than my other AR's and was VERY gritty. I believe the problem is mostly with the detent plunger itself.
1
Very Low Quality
I bought this kit, like the previous review to save money by not buying parts I already had. Unfortunately the only part that looked anything like the picture was the selector :-( The rest of the parts we VERY low quality, the bolt release scratched my lower due to being out of tolerance! The large pins are very rough and don't slide properly. Now I have to remove them and buy some other quality parts. I won't be buying any CMMG components again.