CMMG 55BA419 Bolt Carrier Group 5.56 NATO
Complete mil-spec M16 bolt carrier group for AR-15 platforms. Features 9310 steel bolt with phosphate finish, chrome-lined 8620 steel carrier, and 4140 steel extractor.
Fits: AR-15
CMMG Bolt Carrier Group 55BA419
This is a complete, mil-specification M16 bolt carrier group designed for AR-15 rifles chambered in 5.56 NATO. It represents the gold standard for AR-platform reliability and durability.
Construction & Materials
Bolt: Manufactured from 9310 steel with phosphate finish for superior wear resistance and corrosion protection.
Carrier: Constructed from 8620 steel with chrome lining and phosphate finish. The chrome lining reduces friction and extends service life significantly.
Extractor: Precision-machined from 4140 steel with phosphate finish for consistent, reliable case extraction.
Why This Matters
The bolt carrier group is the heart of your AR-15's reliability. This mil-spec design has proven itself in military and civilian use for decades. The combination of premium steel grades, proper heat treatment, and protective finishes ensures your rifle will function reliably through thousands of rounds.
Whether you're building a new rifle or upgrading an existing one, this carrier group provides the dependability you need for hunting, sport shooting, or home defense.
Features
- 8620 steel carrier
- phosphate finish
- 9310 steel bolt
