BCM® Standard 12.5" 300 BLACKOUT Upper Receiver Group w/ KMR-A10 Handguard

MSRP: $1,006.50
Your Price: $753.45
(You save $253.05 )
(11 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 KMR-A10 KeyMod™ Handguard.

Includes KMSM (KeyMod™ 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: KMR-A10

Copyright 2015 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.***

11 Reviews

  • 5
    Customer review

    Posted by Jordan Wallace on Sep 20th 2019

    Review body is empty

  • 5
    BCM Does it again.

    Posted by David Hunley on May 8th 2019

    They never fail to amaze me. I absolutely love BCM. Fast shipping, excellent quality. Best price for the quality. I trust my life with my BCM gear.

    I served in the Marines as a infantry man than A MOUT Instructor, I was awarded the opportunity to handle a lot of weapon platforms.

    I came across BCM a few times and was extremely impressed with the quality of the Machine work. The accuracy is right up there with the quality as well.

    I own 6 BCM uppers, and I will always be a patron of the company.

    Thanks guys.

  • 5

    Posted by robert fitzpatrick on Feb 2nd 2018

    As usual ..... my experience with BCM with my 300 blackout upper was excellent. I have been ordering rifles and accessories from BCM for years and will continue to do so.

  • 5
    300 BLK upper

    Posted by Tommy Davis on Dec 28th 2016

    Quick service, customer service second to non. Top quality product, and the company that shows proud in their product and in their customers. Will remain a loyal customer for future purchases.

  • 5
    BCM 300 Black Upper Assembly

    Posted by Monte Stanloski on Jun 13th 2016

    BCM products are good looking, well made and milspec. Any more and you're paying for bling. Any less and you're buying junk. Barrels are the right steel, properly lined, the right twist, the right finish, have the M4 feed ramp and are HPT/MPI. This is the third upper assembly (with bolt/carrier group) I've purchased from BCM. Flawless every one. The only variable I've faced was selecting the proper buffer weight for the shorter barrels.

  • 5
    Can't wait to complete my SBR build with this uppe

    Posted by N. Harris on Jun 10th 2016

    The quality of this complete upper receiver is 2nd to none. This is my first AR-15 build and after receiving such a great product from Bravo Company I'm spoiled now. Thank BCM. Keep up the great work

  • 5
    Outstanding product

    Posted by Juan Ramirez on Mar 21st 2016

    I like y'alls products

  • 5
    BCM Standard 12.5" 300 BLACKOUT Upper

    Posted by DK on Mar 14th 2016

    The upper I received is top notch as is their customer service!!!! Bravo Company will always have my business from now on!!!! Thank You

  • 5

    Posted by CS on Dec 10th 2015

    Had so much success with other BCM uppers and accessories that I waited for them to put out an upper in 300 Blackout. Well worth the wait. Quality products from first class people.