BCM® SS410 20" Upper Receiver Group w/ KMR-A15 Handguard (Ionbond BLACK)

MSRP: $1,011.95
Your Price: $868.95
(You save $143.00 )
(9 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: 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.

SS410 Barrel Steel
This 20" BCM barrel is machined from SS410 stainless steel. Featuring hand lapped 1/8 twist rate button rifling and M4 feed ramps barrel extensions, the 410 stainless barrel gives the shooter the best balance of weight and accuracy. 410 stainless is also harder and more corrosion resistant than conventional 416 stainless found in other commercially available precision barrels.
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.
5.56 NATO Match Chamber (USMC SAM-R Chamber)
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.  The SAM-R chamber is the precision version of the 556 NATO chamber.
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.***

9 Reviews

  • 5
    Very helpful in picking the right products

    I appreciated the fast and detailed responses I received via email when trying to decide what to purchase. The customer service staff really helped me with making my decision and made the buying process easy. I was also excited to receive the additional swag with my order. The beanie was especially nice to receive. The quality of the product is amazing as well. I have not had any issues and was amazed by the consistency I was getting out of the barrel. BCM has made a customer for life out of me.

  • 5


  • 5
    Completely satisfied

    Couldn't be more pleased with this incredible product and responsive service through the ordering process. Bravo Company is definitely my first stop. Tremendous product, reputation, and service. Shop with complete confidence.

  • 5

    Great company awesome products! After 5000 rounds down range still holding up and going strong!!

  • 5
    BCM SS410 20" Upper Receiver Group w/ BCM KMR- *AL

    Outstanding quality, great finish, fast shipping, and cool swag included.

  • 5
    Love this reciever

    has a very nice keymod rail that is the perfect size. Not too wide, very well made. Another bcm product checked off my list!

  • 5
    Everything I hoped it would be

    I had searched high and low for a setup with a 20" barrel, and I found a lot of nice barrels separate from an upper. This was everything I wanted, as well as being all black. I was overwhelmed by the quality. The Mod 3 charging handle by VLTOR is absolutely perfect. The pack ins were an awesome little extra as well. Seriously, it was a lot of neat stuff. The fit with my custom built Spike's Tac lower was perfect. I've never been happier with a purchase. Shipping was the quickest out of anyone I've dealt with!

  • 5
    Bcm upper

    Excellent products as well as service. All was very well packaged . thanks for all the extra goodies included with the order.

  • 5
    20" SS410 Upper

    Very nice upper. Feels and looks great... shoots even better. Love the handguard. Light weight with a narrow profile. Exceeded my expectations. My new favorite coyote gun!!