BCM® SS410 16" Mid Length Complete Upper Receiver Group w/ KMR-A13 Handguard 1/8 Twist

MSRP: $1,152.95
Your Price: $819.62
(You save $333.33 )
Maximum Purchase:
5 units
5.56 NATO
Barrel Length:
Barrel Style:
Stock Status:

About the BCM® SS410 16" Mid Length Complete Upper Receiver w/ KMR-A13 Handguard 1/8 Twist

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: 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 16" 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.

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.***

14 Reviews

  • 5
    BCM Upper Receiver Group

    Product is of excellent quality. Shipped within one day of ordering. Will recommend to friends. BCM's reputation precedes themselves. This is by far one of the best upper receivers that I have recived.

  • 5

    I purchased this upper group to pair with my "hell breaker" (spikes/sharps) lower. It fits perfectly, nice and tight. I also went with the bcm bolt carrier group and charge handle so everything was ready to go right out of the box. This kmr alpha handgaurd is very light and great to hold while shooting. I would definitely recommend bcm to anyone and everyone looking to buy or build their own AR-15. You just can't go wrong, if your start out right. Thank you

  • 5
    BCM SS410 16" Mid Length Upper

    I bought 2 of these for varmint hunting.
    These are .5 Moa uppers with black hills 77gr.
    Also shoots Hornady loaded 55gr V-max at .5 Moa or less.
    They feed anything i put in them.
    I cant ask for more out of these.
    BCM, you ROCK!!.

  • 5
    SS410 16" Upper with Keymod

    This upper receiver group looks awesome and looks great on my Spike's Tactical Crusader lower. I really like the feel and weight of the Keymod rail. I can't wait to get out and shoot this thing!

  • 5
    Fantastic response

    Ordered this upper on a Tuesday and had it on Friday!
    Great service and a great product. Fit and finish are excellent.
    Not my first order from BCM and definitely wont be my last.

    PS.....Love the hat.

  • 5
    Excellent product

    I mounted this upper on a Franklin Armory lower and have had very good results. The upper is very high quality and BCM was great to work with. Ordered it on a Wed. and had the upper on Sat.

  • 5
    Awesome product, fast processing!

    This product looks and feels great. Processing, shipping, and packaging were also top notch!

  • 5
    Excellent upper receiver

    I have a BCM upper with a lightweight barrel, and have been so pleased with it I had to get this one. Similar high quality manufacturing, LOVE the KMR handguard's slim profile. I have large hands, so a traditional keymod forend doesn't bother me, but the KMR just feels RIGHT. I am a big fan of Bravo Company; I have yet to be disappointed in one of their products.

  • 5

    Using this Reece upper to replace my Mk12 upper. Much lighter in comparison...which is what I wanted. Love this thing! oh, shipping was super fast as always with BCM!