BCM® MK2 Standard 16" 300 BLACKOUT Complete Upper Receiver Group w/ MCMR-15 Handguard

MSRP: $1,116.50
Your Price: $861.49
(You save $255.01 )
300 BLK
Barrel Length:
Barrel Style:
Upper Receiver:
Stock Status:

Out of stock

About the BCM® MK2 Standard 16" 300 BLACKOUT Complete Upper Receiver w/ MCMR-15 Handguard

  • 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).

What's included:

  • MCMR-15 Handguard

  • MCMR-SM (MCMR Sling Mount)

  • One 3" Picatinny Rail Section

  • BCM® Comp Mod 1 - 762/300 BLK

Featuring BCM’s Patented 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. U.S. Patent Numbers: 10670355, 10677549, D888182

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 H3 buffer with high velocity ammo. If running subsonic ammunition, it is recommended to run your suppressor and a carbine buffer. 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: 16.1+"
  • Barrel Material: 11595E Spec Steel
  • Barrel Finish: Manganese Phosphate (Mil-Spec A-A-59267)
  • Bore & Chamber: Chrome Lined
  • Weight: 3 lbs
  • Twist Rate: 1:7
  • Gas System: Carbine
  • Muzzle Device: BCM® Comp Mod 1 (762/300BLK)
  • Muzzle Threads: 5/8x24
  • Handguard: MCMR-15

Shop Related Products:

Want to see more upper receivers? Click the links below to view more BCM® AR complete uppers!


Bravo Company builds: Life Saving Tools™
Copyright 2023 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.***

8 Reviews

  • 5
    Incredible, Well Built Upper

    I absolutely love this upper receiver. Great build quality. Would absolutely recommend BCM to anyone.

  • 5

    Wow! This might be MY most important review here on BCM simply because there are only a handful for this product as opposed to the hundreds of reviews for other BCM stuff. I just want to start off by saying that I have yet to fire this upper because I need to hang on to whatever ammo I have left till after the election and here in Commufornia everything is bone dry. With that said, I can only review the feel and look of the upper. Right off the bat, it sits well on all my lowers with no wiggle and perfect weight management. The first thing you notice as I'm sure others have is that it feels unusually light for how reliable and sturdy it feels. Not front heavy at all. Pretty amazing really. It comes nicely scented and greased. I gotta say though, there was a super tiny knick on the upper rail showing some metal through the black finish. I gotta assume that is simply because a part like this needs to be tested and handled more so than other parts probably. Other than that, I've ordered a ton of stuff from BCM and everything they sell is the best. They also have the best delivery time ever somehow and according to others (I have yet to experience), their customer service is second to none. I'll always ride with my BCM fam

  • 5
    300blackout upper

    Works perfectly. Also lighter than my other ar15 (.223) . I'm using a light trigger on ( from the lower obviously) it and the upper responds the way its supposed to!!

  • 5
    Quality, Lightweight Upper

    I was having trouble finding a 1:7 twist 300BLK upper and these became available. Sadly many are still unavailable... difficult times for all.

    The MCMR lightweight handguard performs without sacrificing stability or quality. The MK2 upper actually joined better to its Spike’s Tactical billet lower than the upper it replaced. I also picked up a BCG. No complaints. I was equally surprised at the efficiency of order processing and shipping. Thanks BCM!

  • 5
    Best upper receiver

    Light amd hice upper receiver I ever owned. I have 14 guns and this one is the best.

  • 5
    BCM Upper and lower

    The best upper and lower. Bolt carrier group and charging handle are super nice. Thanks

  • 5
    16” 300 blackout MK2

    Extremely happy with this upper. All ammo chambered well with 0 malfunctions. The whole firearm beats expectations and I have only zeroed in. Has to be one of the best rifles I have ever shot.

  • 5
    This upper is amazing. The quality of this product is as good as is gets. I was amazed with how solid this was built and how light it was. The hand guard feels good in your hand and is easy to grip and control. I will be buying more BCM products.

    Customer service was very helpful and answered all my questions in a timely manner. Product was shipped fast!