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

MSRP: $890.95
Your Price: $687.39
(You save $203.56 )
(18 reviews) Write a Review
5.56 NATO
Barrel Length:
Barrel Style:
Upper Receiver:
Stock Status:

Out of stock

All BCM® Upper Receiver Groups with a MCMR Handguard Include:

  • One 3" Picatinny Rail Section
  • One BCM MCMR Sling Mount
Bravo Company builds:  Life Saving Tools™
Manufactured by Bravo Company MFG, Inc. (BCM)
These Barreled Upper Receiver Groups are designed for shooting professionals and responsible civilians with the Mil-Spec features for the demands of their duty. They are fully assembled, headspaced, and test fired.
As a note: BCM barrel components are parkerized separately before assembly. Prior to shipping, all BCM upper receiver groups are test fired for function, laser bore sighted with a Milspec carry handle for sight alignment within Mil-Specs, and then batch samples are test fired for accuracy. As such, the upper receiver group will show handling marks consistent with these quality control procedures.
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. 
M4 Feed Ramp Barrel Extension and Upper Receiver
In developing the USGI M4 carbine as one of the primary weapons for today's infantry, some modifications were performed to the original M16 platform to enhance the reliability of the shorter barreled carbines. With the shorter carbine gas system and the increased gas port pressure, the carbine cycled faster, and at times the cycle rate could be faster than the magazine would feed ammunition. One of the modifications done to increase reliable feeding included enhancing the angle and the length of the feed ramps. This USGI modification was done to both the barrel extension and the upper receiver, creating a longer and steeper feed ramp. These Mil-Spec M4 feed ramps are part of the original CNC manufacturing process. As a result, the factory machined M4 feed ramps on the receiver are hard coat anodized which adds significant strength to the aluminum. This feature is offered on all BCM upper receivers and all BCM barrels.
T-Marked Upper Receiver
The contemporary M16/M4 rifle is built around the concept of modularity. All of the BCM flat top uppers feature a USGI type laser etched T-marks to provide addressing for the remounting of tactical accessories such as optics, laser sights, etc. This enables the weapon platform to be easily configured and then accurately reconfigured for each specific mission.
USGI 1/7 Twist Rate
The USGI 1/7 twist rate of all of the BCM barrels is the preferred twist rate by most professional infantryman. This twist rate has proven very versatile and can effectively run the new heavier 5.56 ammo that is hugely popular with military, private security personal, and personal defense for its' superior ballistics.
Mil-Spec Barrel Steel (Certified Mil-B-11595E)
BCM barrel steel is Mil-Spec per MIL-B-11595E, and is independently certified. This grade (CMV) of steel is a Mil-Spec steel used in the USGI M16 family of rifles; it is stronger and will last longer than the typical barrels offered in the commercial market. This Mil-Spec grade steel gets its' additional strength and rigidity from an increase in carbon and/or vanadium in the alloy. This will offer increased barrel life and performance through use in all types of extreme environments and temperatures.
Chrome Bore and Chamber
One of the first modifications that were made to the original M16 in the mid 1960's was the addition of the chrome lined bore and chamber. It is now a worldwide standard in the industry for a battle rifle. The chrome bore and chamber is harder than the barrel steel and will aid in chambering, extraction, and reliability. It increases velocity, and also resist against fouling and corrosion from extended use in the field. This gives the end user a longer barrel life with less required time in maintenance and cleaning.
Manganese Phosphate Barrel Finish
Barrels are parkerized with the manganese phosphate finish (Mil-Spec A-A-59267). Military specifications also state that the entire barrel surface is phosphate finished to create a porous surface to absorb oil as to resist against corrosion from the elements. BCM barrels are phosphated before installation of front sights. This is a much more extensive assembly operation, but insures that the entire barrel is finished and protected . . .even under the front sight base.
5.56 NATO Chambers
The USGI 5.56 NATO chamber is the best choice for effective deployment, reliability, and compatibility, of higher chamber pressures of military or high quality personal defense ammunition. 

HPT / MP Inspected Barrels
Military specifications require that barrels undergo a HPT (High-Pressure Test) load as a part of quality assurance procedures. Commonly referred to as a proof load, the M197 HPT is rated for 70,000 psi. BCM barrels are proof loaded and then MPI (Magnetic Particle Inspected) to detect any possible flaws in the barrels surface. The barrels are MP inspected with both circular and longitudinal magnetic fields per ASTME1444-01 (current Mil-Spec) to assure a high quality finished product. All BCM barrels are marked HP MP as our proof load marking.
Copyright 2019 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.***

18 Reviews

  • 5
    12.5" upper

    Posted by Neil Zuber on Dec 14th 2020

    Fantastic product and fast delivery. Exactly what I've come to expect from BCM. They continue to earn my business.

  • 5
    In love

    Posted by OCTAVIAN SIMMS on Sep 18th 2020

    This by far is my favorite upper, I hesitated when I first saw it but as soon as it became available again I jumped on it and I'm glad I did. I'm ready for my next build.

  • 5
    BCM MK2 12.5 Upper

    Posted by Eric McAfee on Sep 1st 2020

    High quality at a great price point.

  • 5
    12.5 upper assembly

    Posted by OCTAVIAN SIMMS on Aug 23rd 2020

    love it, ran 500 rounds through it with no issues.

  • 5
    12.5” mk2 upper group

    Posted by J on Aug 23rd 2020

    I just received this complete BCM upper group. I had a really hard time deciding wether to buy the 11.5” bfh or this 12.5”. I haven’t been able to shoot it yet but this upper is great looking. I bought an extra Mlok quick detach point. I didn’t realize it already came with one so if you’re buying the upper, save your money since you get a free one. I finally decided on the 12.5” just based on all the reviews out there for getting the best ballistics out of the 556 but I think the difference is very minimal between the 11.5 and the 12.5. Truth is, this one came up for sale first

  • 5
    Always reliable

    Posted by Thomas Kemp on Aug 23rd 2020

    Quick, easy ordering and shipping. Upper shoots and preforms great with no flaws.

  • 5
    12.5 inch MK2 upper

    Posted by Ray on Aug 9th 2020

    The fit and finish is excellent. Tested it with 55gr soft point ammo and got moa accuracy at 100 yards.!

  • 5
    The best I own

    Posted by Jason on Aug 9th 2020

    The length is perfect. maneuverable and accurate. I threw a sba4 brace, light, hand stop and an Eotech on it and created my perfect AR setup. Bravo Company 10/10. If you are considering this upper-do it and you will not regret it.

  • 5

    Posted by Mike on Aug 9th 2020

    Second BCM upper. Perfect fit, finish, and overall build quality. The 12.5" is my new favorite AR length and works great with the VLTOR A5 buffer system.