When you need a reliable, no-nonsense foundation for your AR-15 build or a direct replacement for a worn component, this Mil-Spec Bolt Carrier Group is the essential core. Built to handle the most common AR-15 chamberings, this BCG is manufactured in the USA from quality materials for consistent performance. It’s the straightforward, dependable heart of your rifle’s cycling system, ready to ship fast from Miami Shooters Supply.
Key Features
- Manufactured entirely in the USA from certified Mil-Spec materials for proper hardness and durability.
- Machined from 8620 steel carrier with a Carpenter 158 steel bolt, the industry standard for strength and longevity.
- Properly staked gas key with Grade 8 fasteners ensures a secure, leak-free connection for reliable gas operation.
- Shot-peened bolt with magnetic particle inspection provides a critical layer of safety and fatigue resistance.
- Chrome-lined carrier interior and gas key reduce friction and carbon buildup for easier cleaning and smoother cycling.
- Compatible with .223 Remington, 5.56 NATO, .223 Wylde, and .300 AAC Blackout chamberings, offering exceptional versatility.
Built For
This BCG is built for the shooter who values proven Mil-Spec reliability over flashy gimmicks. It’s the ideal choice for building a duty-ready rifle, a general-purpose carbine, or as a high-quality spare part for your existing AR-15. Whether you’re at the range or in a defensive training course, this component is designed to function.
Specifications
- Caliber Compatibility: .223 Remington, 5.56 NATO, .223 Wylde, .300 AAC Blackout
- Material: 8620 Steel Carrier, Carpenter 158 Steel Bolt
- Finish: Phosphate (Manganese) exterior with chrome-lined carrier interior and gas key
- Gas Key: Properly staked and torque-secured with Grade 8 screws
- Bolt: Shot-peened, MPI inspected, with a standard extractor and ejector
FAQ
What is the difference between this and a “full-auto” marked BCG?
This is a semi-auto carrier, which is standard for civilian AR-15 parts. The “full-auto” profile refers to a slightly heavier carrier mass; both types function identically in a semi-automatic rifle and this Mil-Spec BCG is built to the same dimensional and material specifications for reliability.
Is this BCG compatible with my pistol-length gas system in a .300 Blackout build?
Yes. This Bolt Carrier Group is designed to function with all standard AR-15 gas system lengths (pistol, carbine, mid-length, rifle) when paired with the appropriate buffer weight. It is an excellent, reliable choice for your .300 Blackout upper.
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