BCM MK2 300 BLK Upper Receiver Group

It's no secret that we're particularly fond of BCM's MK2 lineup. These MK2 300 Blackout uppers are great suppressor hosts as they feature a continuous-taper profile barrel that keeps the weight back towards the receiver and makes the front light and maneuverable. Pair this with the enhanced MK2 upper receiver, which gives you a relocated forward assist and unmatched rigidity, and you have an accurate and consistent foundation that will be ready to perform for years to come. Lastly, an often skipped-over feature is BCM's thermal fit tolerances on both the handguard and barrel extension. This provides superior fit and finish and increases service life and overall consistency.

• 1x BCM Upper Receiver with BCG
• 1x M-LOK Picatinny section
• 1x BCM M-LOK QD mount

FEATURES

Warranty: Covered by BCM's manufacturer warranty. Warranty service is provided by BCM.

UPPER FEATURES

• Manufactured by Bravo Company MFG, Inc. (BCM)
• Fully assembled, headspaced, and test-fired
• Features BCM’s proprietary MK2 upper receiver for enhanced rigidity
• Relocated forward assist for easier charging handle access
• M4 feed ramp barrel extension and upper receiver for reliable feeding
• T-marked upper receiver for easy configuration of tactical accessories
• Mil-Spec barrel steel (Certified Mil-B-11595E) for strength and durability
• Chrome bore and chamber for enhanced chambering, extraction, and reliability
• Manganese phosphate barrel finish for corrosion resistance
• HPT / MP Inspected barrels for quality assurance and flaw detection

BOLT CARRIER FEATURES

• BCM (MPI) complete bolt carrier group for AR-15, M16, or M4
• Parkerized exterior with chrome-lined inside carrier
• Machined to USGI specifications, Full Auto Profile
• M16/M4 carrier with Mil-Spec chrome-lined gas key
• Gas key heat-treated and chrome-lined, securely fastened with grade 8 fasteners
• Bolt assembly machined from Mil-Spec Carpenter No. 158 steel, shot peened
• Includes tool steel extractor and ejector
• Includes BCM extractor spring
• HPT (High-Pressure Tested) and MPI (Magnetic Particle Inspected)
• BCM test fires for function before shipping

Upper Specifications

Made in the USA.

BUFFER RECOMMENDATIONS

INDEX:

Sprinco Hot White: In the middle of a standard carbine spring and the Blue spring, roughly 7-8% stiffer than standard.
Sprinco Blue: 15% stiffer than standard carbine springs.
Sprinco Green: Rifle length spring for A5/MK2 buffer systems.