GUNBUILDER'S LOWER PARTS KIT FOR AR-15 LOWER
GUNBUILDER'S LOWER PARTS KIT FOR AR-15 LOWER
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CMMG - AR-15 Gunbuilder's Lower Parts Kit

34 Reviews
AR-15 Gunbuilder's Lower Parts Kit
Brownells #
100014538
MFR #
55CA601
UPC
815835015408
$34.99
Coupon Code
Purchase Limit Help

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Standard Shipping Estimated Delivery
Estimated delivery: Oct 30
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International purchase information

Specifications
Make Model Fit:
AR-15.Universal
Quantity:
1
Restriction
Gun Part Restrictions:
Yes
Prop 65 restriction:
Warning! Cancer and Reproductive Harm. Www.p65warnings.ca.gov
View US State Restrictions
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International purchase information

What is the CMMG - AR-15 Gunbuilder's Lower Parts Kit?

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.

Gun Part Restriction
Gun Parts have restricted shipping to CA.

Prop 65WARNING: Cancer & Reproductive Harm - www.P65Warnings.ca.gov

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GUNBUILDER'S LOWER PARTS KIT FOR AR-15 LOWER REVIEWS

4.6
34 Reviews
5 Stars
82%
4 Stars
9%
3 Stars
3%
2 Stars
0%
1 Stars
6%
Reviews Summary
Customers are highly satisfied with the GUNBUILDER'S LOWER PARTS KIT, praising its quality, fit, and value for money. Many enjoy the convenience of labeled parts, making assembly easier, and appreciate the ability to customize their builds. A few wished for more options like an ambidextrous model, but overall feedback is overwhelmingly positive.
What Reviewers Are Saying
Product Quality
92%
Reviewers frequently highlight the superior quality of the parts, noting excellent machining and finish. Many assert that every component functions flawlessly, contributing to a reliable build experience.
Ease of Assembly
75%
Numerous customers mention the simplicity of assembling the kit, especially praising the labeled packaging that aids even beginners. Many highlight their success in building ARs using this kit without any issues.
Customization Options
42%
Several reviews express satisfaction with the kit's flexibility, particularly the absence of standard parts like a trigger and grip, allowing users to choose their own. Reviewers appreciate this approach as it saves money and enhances personalized builds.
5
AR-15 parts
Worked as advertised.
by William M. on March 30, 2026
Verified Purchase
Was this review helpful? 1
5
Worked great
All parts there. All parts fit. All parts function. Worked great.
Would you recommend this? Yes, I would recommend to a friend
by SCOTT A. on February 05, 2026
Verified Purchase
Was this review helpful? 2
5
Quality set
I ordered this for a Wilson Combat lower build. The parts were all quality parts and had no issues. Will definitely buy this again for the next build as well as stocking spare parts.
Would you recommend this? Yes, I would recommend to a friend
by MARC J. on September 23, 2025
Verified Purchase
Was this review helpful? 2
5
Awesome product
Cmmg parts are some of the best you can buy. I really like how the parts are packaged.
Would you recommend this? Yes, I would recommend to a friend
by George W. on January 05, 2025
Verified Purchase
Was this review helpful? 2
5
Top notch kit
Good quality at a reasonable price. No parts that may not be used like a pistol grip or mil spec trigger.
Would you recommend this? Yes, I would recommend to a friend
by Paul on October 03, 2024
Was this review helpful? 1
View All 34 Reviews
Customer Questions
0 Questions