$125.99
28 in stock
Online inventory may differ from in-store availability.
Quick turnaround so you get your gear sooner.
Trusted checkout with industry-standard protection.
Keeping Traditions Alive Since 1953
Secure Transactions provided with 
The CMMG M16 Bolt Carrier Group is a fully assembled, Mil-Spec unit ready to go into any standard AR-15 chambered in 5.56 NATO, .223 Remington, or 300 Blackout. It ships complete with the bolt, carrier, gas key, cam pin, firing pin, and firing pin retaining pin already installed, so there is no sourcing small parts or hunting down a headspaced bolt. Drop it in, run your function check, and you are ready for the range.
CMMG went with the materials that seasoned builders look for. The bolt is machined from 9310 steel, the extractor from 4140, and the carrier from 8620 steel that is chrome lined on the inside where it matters most for smooth cycling and easier cleanup. Everything wears a manganese phosphate finish that shrugs off wear and corrosion during regular use, and the bolt is magnetic particle inspected to catch flaws before it ever leaves the shop.
Because this is the M16-profile carrier rather than a lightweight or semi-auto cut, it carries the full mass at the rear. That extra weight helps the action cycle consistently and plays nice with a wide range of gas systems, buffer weights, and loads. It is a common pick for folks running suppressors or building a rifle they want to feed a mix of ammo without chasing reliability gremlins.
This BCG works with both semi-auto and full-auto lowers, and it drops into standard M4, AR-15, and M16 uppers without modification. If you are building or maintaining a 300 Blackout upper, the same bolt handles it since 300 BLK shares the .223/5.56 case head. Range reports on this carrier group have been steady, with plenty of owners logging hundreds of rounds with no hiccups. Backed by CMMG's Lifetime Quality Guarantee, it is a dependable heart for a fresh build or a solid upgrade over a worn factory carrier.
Yes. The M16 profile carrier is Mil-Spec and runs in both semi-auto and full-auto lowers, so it drops into standard M4, AR-15, and M16 uppers without any modification. The full-mass carrier is a popular choice even for semi-auto builds because the added weight helps the action cycle consistently.
You can. 300 Blackout uses a .223/5.56 case necked up for a larger bullet, so it shares the same rim and case head as 5.56. That means this bolt works with 300 BLK, and the only part that needs to be caliber-specific is the barrel.
It is. The bolt, carrier, gas key, cam pin, firing pin, and retaining pin all come assembled out of the box. Drop it into your upper, do a quick function check, and it is ready to run.
The bolt is 9310 steel, the extractor is 4140 steel, and the carrier is 8620 steel with a chrome-lined interior. Everything gets a manganese phosphate finish for corrosion and wear resistance, and the bolt is magnetic particle inspected for quality.
| UPC | 852005002431 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 55BA419 |
| Color | Black |
| Length | 9.2500 |
| Model | |
| Product Type | Action |
| Shipping Weight | 0.7375 |
You must be logged in to post a review.
Reviews
There are no reviews yet.