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

MSRP: $1,006.50
Your Price: $753.45
(You save $253.05 )
(4 reviews) Write a Review
300 BLK
Barrel Length:
Barrel Style:
Stock Status:

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

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 Rob on Aug 11th 2021

    I can’t say enough about this upper. Had a chance to hit the range and this thing is accurate. I had big plans for this build. I was going to have it coated to match a FDE lower build. After receiving the upper plans changed , I just can’t bring myself to cover up all the fine work and detail this upper has. Great work guys will be buying more from BCM

  • 5
    Top notch

    Posted by Ben Smallen on Jul 22nd 2021

    I love shooting this! Accurate and looks sharp. I want to get another now!

  • 5
    12.5 Mcmr Blackout Upper

    Posted by Dan Weinberg on Mar 28th 2020

    Using for home defense and would trust my life with it. Going to buy another one. Outstanding! The enhanced and fluted barrel was rated highly by Mr Gunsngear.

  • 5
    Customer review

    Posted by Daniel Haugh on Apr 10th 2019

    The best upper for the money hands down. Love BCM anything!