BCM® MK2 Standard 12.5" 300 BLACKOUT Upper Receiver Group w/ MCMR-10 Handguard

MSRP: $925.00
Your Price: $695.90
(You save $229.10 )
(4 reviews) Write a Review
Stock Status:

Out of stock

BCM® 300 Blackout Upper Receiver Groups

Continuous taper barrel profile designed for optimal weight, balance, and performance.

Barrel profile fluted toward the rear near chamber area - Increases strength and heat dissipation.

Tapered barrel profile out front, for easier maneuverability.

No sharp handguard cap shoulder for improved barrel harmonics and improved accuracy.

Muzzle threaded in standard 30 cal (5/8x24).
Includes MCMR-10 Handguard
Includes MCMR-SM (MCMR Sling Mount)
Includes One 3" Picatinny Rail Section

Includes BCM® Comp Mod 1 - 762/300 BLK

Featuring BCM’s Patent Pending MK2 Upper Receiver
This proprietary design offers enhanced rigidity over the USGI product.  The increased rigidity limits barrel deflection which aids in consistency/accuracy.   Less flex also reduces premature damage, wear, and failure of bolt lugs from misalignment.   A gas expansion chamber is machined above the charging handle track, combined with dual vents machined at the rear (each side, above charging handle latch) help to redirect and vent gas away the shooters face.

BCM® has taken great care to ensure the best possible performance and interchangeability. However, due to the large operational range of 300 Blackout ammunition in the market place, BCM® cannot guarantee function will all ammunition types in all conditions. These barrels were designed to run with a carbine buffer with subsonic ammo and a H3 buffer with high velocity ammo. Fine tuning may be required in limited instances based on ammo and buffer choices that work best for the desired application. BCM® also recommends running the Crane O-ring (provided with all BCM® Bolt Carrier Groups) over the extractor with 300 Blackout.

  • Caliber: 300 Blackout
  • Barrel Length: 12.5"
  • Barrel Material: 11595E Spec Steel
  • Barrel Finish: Manganese Phosphate (Mil-Spec A-A-59267)
  • Bore & Chamber: Chrome Lined
  • Weight: 2.5 lbs
  • Twist Rate: 1:7
  • Gas System: Pistol
  • Muzzle Device: BCM® Comp Mod 1 (762/300BLK)
  • Muzzle Threads: 5/8x24
  • Handguard: MCMR-10

Copyright 2017 Bravo Company MFG, Inc.
***This product contains chemicals/materials known to the State of California to cause cancer and other reproductive harm. To learn more, visit www.p65warnings.ca.gov.***

4 Reviews

  • 5

    Posted by Chad Loskota on Jul 1st 2020

    First BCM I've owned. Ordered after issues with Aero upper fulfillment. BCM was quick with fulfilling and shipping this order. Recieved the upper and went to the range save day. Held consistent and tight groups at 100 y.

  • 5
    BCM upper 12.5

    Posted by Stanley Douglas on May 18th 2020

    Great product

  • 5

    Posted by David Johnson on May 13th 2020

    For a CT “other” build. I would have to say, as an owner of 7 ar15’s in multiple calibers, that don’t sit in a safe, that these are the best you’ll find in this price range. Plan on buying 3 more in next few weeks.

  • 5
    12.5 300 black out upper

    Posted by Unknown on Apr 29th 2020

    Absolute great craftsmanship and high quality as always from BCM. This 300 upper looks soo good with my spike lower. Can’t wait to get a can and shoot some subsonic and see how quite we can go!!