CMMG AR-15 Zeroed Lower Parts Kit Gunbuilder’s Kit
$79.00
2 in stock
Customization is endless with the AR15 platform which is why the CMMG ZEROED Mk4/AR15 Gunbuilder’s Kit includes all of the essential parts except the most commonly upgraded ones: Trigger Guard Fire Control Group and Pistol Grip. Check out our interactive install walkthrough video below or read the CMMG Resources LPK Install article for an in-depth breakdown. All parts meet or exceed mil-spec. All installation hardware included.
Kit Includes:
| Upc | 810097502314 |
|---|---|
| Manufacturer | CMMG |
| Manufacturer part number | 55CA6BA |
| Shipping weight | 0.12 |
BJ Firearms LLC is a federally licensed firearms business focused on providing quality firearms, accessories, and related services while promoting responsible ownership, education, and community engagement.
The company was founded to serve firearm enthusiasts with knowledgeable service, real-world experience, and a commitment to professionalism and safety.
We focus on real experience, personalized service, hands-on product knowledge, and community involvement — not just sales. Our goal is to help customers make informed decisions and feel confident with their equipment.
Yes. We operate as a federally licensed firearms dealer (FFL), following all applicable federal, state, and local regulations.
Yes. We partner with trusted suppliers to provide quality products and reliable sourcing.
Yes. We partner with content creators and industry professionals to provide real-world insights and experiences.
We work with everyone — from first-time buyers to experienced enthusiasts. Education and guidance are a big part of what we do.
We offer firearms, accessories, gear, and related equipment depending on availability and customer needs.
Yes. We help customers evaluate their needs, experience level, and intended use to find the right fit.
Yes. Depending on the request, we can help source specific products or assist with custom configurations.
Yes. We actively engage in hands-on experiences, demonstrations, and community-related firearm activities when possible.
Yes. We support content that helps people learn about equipment, safety, and responsible firearm ownership.
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