BCM® Standard 12.5" Carbine Complete Upper Receiver Group w/ KMR-A10 Handguard

MSRP: $948.35
Your Price: $725.35
(You save $223.00 )
Maximum Purchase:
10 units
5.56 NATO
Barrel Length:
Barrel Style:
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About the BCM® Standard 12.5" Carbine Complete Upper Receiver w/ KMR-A10 Handguard

All BCM® Upper Receiver Groups with a KMR-A Handguard Include:

  • One 3" Picatinny Rail Section
  • One BCM KeyMod Sling Mount

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.

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.***

29 Reviews

  • 5

    The 12.5 holds one of the tightest groups at 50 yards. Extremely happy with this product compared to more expensive, other company products. BCM truly exceeds the competition.

  • 5
    12.5” Probably Perfect for CQB to 300y

    I’ve owned 3 BCM uppers and they are completely reliable and finely crafted.

    Haven’t shot this 12.5” for accuracy past 100y, but it performed well at that range.

    Seems the perfect size for a can.

    Buy BCM, all mine have been flawless.

  • 5
    Best Short AR Upper

    I heard a cool kid say that 12.5” is as short as they go for a CQB 5.56 AR. That makes sense to me and it seems you still have enough barrel push the round fast enough to get accurate hits past 300. I would like to suppress my gun as it is definitely less quiet with less barrel, but the fit, finish and function of this upper was every bit as good as my previous two BCM uppers. To me this is the gold standard for American Rifles.

  • 5
    BCM® Standard 12.5" Carbine Upper Receiver Group w/ KMR-A10 Handguard

    Fantastic. I want 2 more if they'll ever come back in stock

  • 5
    Kmr 12.5 upper

    Outstanding quality. Light. Accurate. My other uppers will now collect dust. The BCM upper is worlds better.

  • 5
    BCM Upper 12.5inch

    This is my 3rd 12.5inch BCM upper and will complete my 7th BCM firearm. I've owned many other brands. Some have been of high price and high quality but plenty have been a disappointment. From my experience BCM always delivers top quality with a reasonable price. Very satisfied with ALL BCM pieces I own.

  • 5
    Upper reciver

    The 12.5 upper is an awsomeweapon system. I attached it to my pistol and got it zeroed. We Ran some drills and put 200 rounds through it. The upper worked flawlessly with or w/o the suppressor attached. I would recommend it to friends and would buy it again.

  • 5
    Excellent Quality and function

    Tried to be budget conscious and went with another vendor. There were Issue with quality and function- Sent it back for a refund. I went with BCM and glad I did.
    Quality and finish are perfect. I was surprised of how light weight and trim the upper is.
    I have no doubt that this is a trust worthy upper and that is will go bang when i want it to.

  • 5
    BCM Standard 12.5" Carbine Upper

    I am very impressed with this upper. It came well lubed, everything was tight, it fit my lower assembly perfectly. I anticipated a few issues the first time out, but I had zero problems with feed, ejection, cycling. It performed perfectly. I’m looking forward to my next outing.