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

MSRP: $873.35
Your Price: $675.35
(You save $198.00 )
(27 reviews) Write a Review
5.56 NATO
Barrel Length:
Barrel Style:
Stock Status:

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.
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.***

27 Reviews

  • 5
    First time building a rifle, thankful i got a BCM

    Posted by Tylor Gochenour on Sep 12th 2019

    Review body is empty

  • 5
    AR upper

    Posted by Artur Kachkovskiy on Aug 20th 2019

    Not much to say. If you looking at BCM items you know quality and you get exactly that when you open the box. Could not be more happier and will be coming back for more.

  • 5
    Love It!!!!!!!! Couldn’t have picked better upper

    Posted by Colin Crandall on Jul 22nd 2019

    The gun runs like a sweet dream and is as smooth as butter to make it the most reliable and would trust my life and property to the upper and reliability therefore my favorite gun I Own?

  • 5
    BCM 12.5" upper smokes paper and steel

    Posted by Brian McNeilly on Jul 17th 2019

    Finally saved up to get my 12.5" upper because I watch too much Garand Thumb at work. I built it out with most BCM parts and slapped an old eotech 512 and got to take it to the range for 5-25m carbine drills the very next weekend. Fitment is amazing, matches well with all 4 different-manufacturer milspec lowers i own. While zeroing with cheap ball ammo, i had two 4-round groups with all holes touching. Recoil/timing felt great, I trust this rifle with my life.

  • 5
    12.5 Upper

    Posted by AOC on Jul 17th 2019

    Could not be happier with the quality of BCMs build. The upper shoots 1.25 MOA with m193 and a trijicon 1-4. 300 rounds through it so far no hiccups, but I will be taking it to a class this month to put 1500 through it. Insanely fast shipping and quality workmanship from BCM. Buy with confidence.

  • 5
    12.5 MCMR

    Posted by Ben Boesenberg on Jun 2nd 2019

    So far it’s amazing, perfect balance of dwell time and reliability. Very happy with my purchase. Strongly suggest if running unsuppressed.

  • 5
    Upper Review

    Posted by Jarrad Truog on May 4th 2019

    Accurate, Reliable, and overall excellent

  • 5
    12.5” Upper

    Posted by Brandon Davis on Apr 14th 2019

    Communications, quick shipping, quality are all A+ with BCM. Not a better company to do business with.

  • 5
    Outstanding product

    Posted by Wesley Soto on Apr 10th 2019

    This upper is a wonderful addition to my toolbox. The thing is very well built, extremely lightweight and accurate. I will deffinitely continue to buy BCM products as they are amazing keep rocking it guys!