BCM® Standard 20" Complete Upper Receiver Group w/ KMR-A15 Handguard

MSRP: $962.65
Your Price: $747.35
(You save $215.30 )
5.56 NATO
Barrel Length:
Barrel Style:
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Out of stock

About the BCM® Standard 20" Complete Upper Receiver w/ KMR-A15 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 ammounition. 

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.***

45 Reviews

  • 5
    BCM® Standard 20" Upper Receiver Group w/ KMR-A15 Handguard

    Very happy with build and quality. Just need you all to get some complete lowers built so I can complete my build.

  • 5
    20” bcm upper

    It has a Nice heavy feel off the gun and I shot 1/2” groups at at 100 yards when I went to the range to sight in... It shoots great I would recommend buying this...

  • 5
    Three Years Later

    This was my first AR15 "build" - I purchased the upper about three years ago. I have swapped nearly every part on the PSA lower I paired it with, but the upper remains the same as day 1. To this day I am still able to hit a silhouette target with ease at 600yds. I just ordered my second upper from BCM. My only disappointment is that I lost the black and mesh hat that came with my first upper. Here's to the next few thousand rounds. Great quality company, both products and customer service.

  • 5
    I've used & abused many of your components. I've never been disappointed.

    Fit & function of the parts are second to none! By far one of the finest examples of precision machining & quality control in the market. Despite the reasonable price.

  • 5
    Customer review

    Excellent product, received in less then expected time.

  • 5
    Great upper

    This upper is awesome just like everything bravo conpany makes. Accurate, tough, and light.

  • 5
    Recent order

    My order came swiftly and well packaged . Lots of extras also in the box . Haven't had a chance to try out the new upper but I'm sure I will not be disappointed. Thanks bravo company

  • 5
    Fantastic Upper

    Prompt service. Perfectly functioning upper. I got it with the BCG and a large latch charging handle. The latch is great to work with a scope bell over the charging handle, but I could have gone with a medium latch I think. The upper/BCG easily ate everything I fed it - including steel Tul 223, brass Wolf Gold, and some Remington brass.
    Accuracy is excellent. Shooting cheap steel I was getting 1-1.25" at 50 off a "magazine monopod," and I was hitting 4" steel at 200 yards easily. I havent done any bench rest formal accuracy testing, but when I miss I know it's shooter error.
    The other day my friend and I ran ~500 rounds fairly quickly. No feedinn issues, barrel got hot enough to produce a nice mirage, but accuracy didn't deteriorate terribly, and the hand guard didn't get too hot to hold.

  • 5
    Nothing but the Best

    All I can say is thanks for an outstanding product BCM! Definitely one of the finest ARs in my collection 1 1/2 groups at 100 yards with my red dot more than good enough for me.