BCM® Standard 20" Complete Upper Receiver Group w/ KMR-A-13 Handguard

MSRP: $884.35
Your Price: $686.35
(You save $198.00 )
5.56 NATO
Barrel Length:
Barrel Style:
Stock Status:

Out of stock

About the BCM® Standard 20" Complete Upper Receiver w/ KMR-A-13 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.***

22 Reviews

  • 5

    So happy I decided to go with the 20 in upper. Super quality, its very lightweight, and a vast improvement over my previous PSA carbine upper. I was just astounded at the craftsmanship when i took it out of the box. Well worth the money. Smooth shooting and very accurate, having only shot .223 Wolf gold out of it so far. The free float barrel seems to help out a lot, that along with the rifle length gas system lowering the recoil. BCM is an awesome company they even sent me all kinds of cool stuff like posters, keychains, stickers, and a hat with my order. Thanks BCM! Will heartily recommend!

  • 5
    Sweet as usual..........

    The usual well put together Bravo Co. upper. Service prompt and delivery quick. Nice shooting complete upper. Like the KMR handguard. Thinking of changing all other uppers to KMR units. Would recommend buying ONLY from BCM

  • 5
    Nice Rifle Upper

    Couple hundred rounds through this upper so far - accurate and reliable with no issues with any kind of ammo. Very nice machinery. Please pardon the delayed feedback - currently at AT.

  • 5
    Excellent Upper, fast delivery

    The upper arrived as described. Quality is obvious, and weight is nice and light. Shipped very quickly after order was placed. Arrived in good packaging, with complimentary cap and paraphernalia.

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

    Semi building my first AR, I decided to go with this BCM upper! Super pleased that I did! WOW, just an amazing piece of work! These guys put there heart and souls into their work!!

  • 5
    20" Complete Upper Assembly

    This was my first purchase of a complete upper assembly. After researching various manufacturers I found BCM had virtually no bad reviews. The upper had all of the elements I was looking for at a fair price. I like the low profile gas system. The KeyMOD system is nice and I really like the barrel nut. If I want to re-barrel it will not require screwing around with the milspec nut to align the gas tube while tightening the barrel nut. I went on guts and added the charging handle. This is a great addition and it is very easy to use. I should have purchased one of these long ago. as a complete assembly it is well assembled and good craftsmanship is apparent.

  • 5
    great buy

    I was able to put a few rounds through my new upper yesterday and was very happy with the accuracy and performance. The barrel is not broken in yet but on target. Also the new KMR Alpha handguard is awesome. I love it size and feel not to big and bulky (lighter) and still gives me the flexibility i wanted and thanks for the hat and stickers. Always looking for a new hat.....

  • 5
    BCM Standard 20" Upper Receiver Group

    Amazing quality.

  • 5
    20" upper receiver group

    Snapped it onto my lower group and cycled through 100 rounds right out of the box with no problems whatsoever. Feels great and shoots great.