Your bolt carry group, or BCG, is critical to your .300 Blackout rifle shooting experience. A BCG helps to make your firing and reloading process go smoothly and makes your entire rifle less likely to jam or glitch. It guides the next round from the magazine and into the chamber, which ensures the round is placed perfectly

The result is a smooth, jam-free firing experience and greater shooting confidence. More confidence in your weapon translates to less hesitation when chasing down big game and increased accuracy at shooting competitions. Here are the top 7 300 Blackout BCGs to help you perform at your best. 

Editor’s Choice: M16 Mil-spec MP/HPT BCG 

This BCG comes fully assembled and polished off in a military-style matte black phosphate finish. Every BCG bolt is Magnetic Particle Inspected (MPI) and machined from Carpenter 158 steel for perfect, dependable action. 

After machining, each bolt is shot-peened, heat-treated, and high-pressure-tested so you can count on your firearm, shot after shot. The carrier is crafted from 8620 hardened steel for optimal delivery. To purchase the M16 Mil-spec MP/HPT BCG for your next hunting or range trip, click here


Top 7 Best 300 Blackout BCG Reviews 

1. M16 Mil-spec MP/HPT BCG: Best 300 Blackout BCG



M16’s Mil-spec MP/HPT BCG is top-of-the-line due to the quality of BCG assembly. Pressure-tested, hardened steel construction delivers reliable action. While it might be necessary to oil the gas rings upon arrival, this BCG won’t disappoint. The BCG comes fully assembled with a bolt carrier, gas key, cam pin, firing pin, firing pin retaining pin, and bolt

The interior of the bolt carrier is lined with phosphate to enhance the BCG’s action. Sealed gas rings and staked and torqued gas key screws testify to this product’s rugged construction. This BCG is compatible with automatic and semi-automatic AR-15s and M16 firearms. 

Who Should Get This? The dedicated competition shooter or experienced hunter will love the attention to detail and quality craftsmanship of this product. Boost your confidence with this BCG.

2. TRYBE Defense Milspec AR-15 AAC Complete Bolt Carrier Group: Best 300 Blackout BCG for the Money



Available in a variety of finishes, the TRYBE Defense Milspec AR-15 AAC Complete Bolt Carrier Group combines stellar construction with affordability. This BCG arrives fully assembled and includes a firing pin retaining pin, a firing pin, cam pin, bolt, bolt carrier, and gas key. It’s compatible with multiple firearms, including .223, 5.56, and .300 AAC Blackout chambered AR-15s.

The customizability, combined with Magnetic Particle Inspected (MPI) High-Pressure-Tested bolts, makes for a budget-option that feels like a high-end, upscale BCG. You’ll get reliability shot after shot, and smooth action can help you bolster your confidence and performance both in target practice and in shooting competitions. It’s also suitable for hunting, especially for intermediate hunters who specialize in big game such as elk or bear.

Who Should Get This? Beginner-to-intermediate hunters and competition shooters will find that this durable, well-constructed BCG bolsters confidence, helps them grow as shooters, and provides reliable action on the hunt and the range. 

3. Radical Firearms M16 BCG 556: Best 300 Blackout BCG for Self-Defense



Practicality and sturdy construction define this Radical Firearms BCG. This M16 bolt carrier group is compatible with both AR-15 AAC Blackout build rifles and self-defense DRD pistols with echo triggers. Pressure-tested steel construction pumps out hundreds upon hundreds of rounds without fail. It arrives promptly and in mesh wrapping for safe transit. 

This bolt carrier group is compatible with AR-15 upper chambered in 5.56, as well as .223, .300 AAC, or .22 Nosler–no bolt change necessary. The nickel boron finish provides a classic, understated look that competition shooters will appreciate. While the finish is not as upscale as other options on this list, shooters attest to this BCG’s reliability and sheer functionality. Boost your confidence and your accuracy with Radical Firearms’ BCG.

Who Should Get This? Perfect for self-defense enthusiasts and competition shooters who want a reliable BCG but don’t want to break the bank, this Radical Firearms M16 BCG delivers functionality. 

4. Brownells – M16 5.56 Bolt Carrier Group TiN MP: Best Competition 300 Blackout BCG



Brownells M16 5.56 BCG proves that stunning aesthetics and down-to-earth practicality can work hand in hand. You will love the extreme durability and the beautiful looks of the bright, platinum-gold, titanium-nitride finish. The carrier is crafted from 8260 tool steel while the bolt head is machined from 9310 tool steel

This easy-to-install BCG is suitable for .300 AAC blackout usage, as well as for use with .223 Remingtons, 5.56 NATOs, and .204 Ruger AR-15s. It also includes a handy M16 carrier notch for compatibility with full-auto rifles. In total, this BCG weighs in at 12 ounces, making it a relatively lightweight addition to a competition setup that will look just as good behind glass as it will feel on the range

Who Should Get This? Brownells M16 5.56 BCG is for the dedicated competition shooter who is looking for that perfect, confidence-boosting combination of new-fangled flash and traditional functionality.

5. Brownells AR-15 Bolt Carrier Group 5.56x45mm Nitride MP: Best 300 Blackout BCG for Hunting



Brownells delivers again with this budget-friendly, made-in-America bolt carrier group that is built to last. A nitride coating protects the entire bolt carrier group for years of smooth action. 

Each bolt is Magnetic Particle Inspected (MPI) and machined from shot-peened, heat-treated 9310 tool steel, while the carrier is crafted from 8620 tool steel. The result is a dependable BCG that will stand up to years of abuse in the woods, in the field, and at the range. 

Each BCG includes a cam pin, a firing pin, firing pin retaining pin, bolt carrier, bolt, torqued-and-staked gas key, and extractor with a rubber insert and pin. The BCG comes fully assembled and ready to use, allowing for easy installation. 

Who Should Get This? For beginner, intermediate, and seasoned hunters who want to save money and get the job done, this BCG provides years of smooth shooting and reliable action.

6. 2A Armament AR-15 Bolt Carrier Group: Best High-End 300 Blackout BCG 



This Regulated Bolt Carrier (RBC) is one of the most sophisticated, high-end BCGs on this list. Lightweight and incredibly adjustable, the gas regulating gate can be anywhere from fully open to fully closed without needing to be broken down. As such, it can be made to fit almost any combination of barrel lengths, springs, buffers, and suppressors

The RBC’s bolt is crafted from 9310 heat-treated, QPQ nitride-coated tool steel while the carrier is made from QPQ nitride-coated 8620 steel. The extractor and carrier key are both heat-treated and nitride coated

Altogether, this RBC weighs in at 7.9 oz and is 100% American-made in the state of Idaho. Compatible with .223 Remington, 5.56 mm NATO, and .300 AAC Blackout cartridges, its sleek, understated appearance belies an incredible, multi-functional performance.

Who Should Get This? For the dedicated firearm enthusiast who wants nothing but the highest-quality and most functional BCG, this regulated bolt carrier is lightweight, fully adjustable, and endlessly practical. 

7. Faxon Firearms AR-15 Lightweight 5.56 Bolt Carrier Group: Best 300 Blackout BCG for Harsh Conditions



Due to the QPQ-style nitride bath finish, the BCG’s natural smoothness is amplified for flawless action that requires less pressure and less gas to operate. The result is a wear-resistant, long-lasting, and corrosion-resistant superfinished BCG that will stand up to years of use, even in harsh environments. 

This makes Faxon Firearms’ BCG an excellent choice for hunters who head out in damp, cold conditions and need reliable bolt carrier action, no matter the weather.

This BCG’s construction is thoughtful at every level. The bolt, the carrier, extractor, carrier, and key are Mil-spec heat-treated, with the bolt shot-peened and rear bolt lugs chamfered for enhanced reliability. In order to provide a lifetime of service, gas keys are fully staked with Grade 8 fasteners

Who Should Get This? For the experienced hunter who heads out into deep cold or wet, wild weather to chase prized trophies, this BCG provides reliable, dependable action and fantastic construction.

Best 300 Blackout BCG Overall

The M16 Mil-spec MP/HPT BCG is built to last for years. A phosphate-lined bolt carrier interior provides corrosion-resistant, smooth action, while the exterior is coated with a matte black phosphate finish for durability. The pressure-tested, shot-peened, heat-treated, and Magnetic Particle Inspected (MPI) bolt helps enhance the shooter’s confidence in their firearm

Compatible with both automatic and semi-automatic AR-15s and M16 firearms, this BCG strikes the perfect balance of value for money and superior construction.

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