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

MSRP: $884.35
Your Price: $686.35
(You save $198.00 )
(16 reviews) Write a Review
5.56 NATO
Barrel Length:
Barrel Style:
Stock Status:

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

  • One 3" Picatinny Rail Section
  • One BCM KeyMod 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 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.
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.***

16 Reviews

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

    Posted by Chuckster Talbot on Jun 10th 2016

    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

    Posted by RAW on May 11th 2016

    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
    BCM Standard 20" Upper Receiver Group

    Posted by anonymous on Feb 24th 2016

    Amazing quality.

  • 5
    Very impressed

    Posted by anonymous on Feb 8th 2016

    Very light for a 20''. KMR is great. Quality is top notch and the upper is very accurate. Also, was amazed at how much swag got thrown into the package. Absolutely exceeded all expectations.

  • 5
    BCM standard 20" upper receiver group

    Posted by Brian ENRIQUEZ on Feb 1st 2016

    This is a really nice upper and was really surprised on how light the upper is can't wait to shoot it and will be buying another one soon

  • 5
    Buying from the best

    Posted by Walter A. on Dec 5th 2015

    Arrived quickly and %100 satisfied with my new BCM UPPER. Amazed on how light it is. Thank you!

  • 5
    BCM 20" Upper Review

    Posted by Cory Welsch on Nov 20th 2015

    I am very impressed with the quality of this upper. The handguard feels rock solid, yet makes the rifle feel so light and maneuverable. The overall fit and finish is outstanding. Great product!