BCM® SS410 18" Rifle Upper Receiver Group w/ KMR-A15 Handguard 1/8 Twist

MSRP: $967.95
Your Price: $780.95
(You save $187.00 )
(67 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 18" 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.***

67 Reviews

  • 5
    BCM SS410 18” Rifle Upper

    Posted by David Murringer on Apr 10th 2019

    I am very pleased with this upper. The Service was Excellent too.

  • 5
    Great product, great price!

    Posted by Justin Young on Jan 10th 2019

    Absolutely love my new upper! It arrived very fast and right out of the box, I plugged everything together and gave it a run. It worked flawlessly! I was very impressed! Thank you Bravo Company. You will defiantly be revciging my business again.

  • 5
    Upper receiver 18”

    Posted by patrick keigley on Mar 26th 2018

    Product was received in a expedient and timely manner. Everything looked excellent and well packaged. Happy buyer.

  • 5
    Very impressed.

    Posted by matthew Worden on Oct 27th 2017

    This is my second BCM upper receiver and I couldn't be happier. Fit and finish are excellent and accuracy is outstanding.

  • 5
    Love at 1st 100yard group

    Posted by Ryan M on Oct 27th 2017

    I already have and love a 16" BCM chrome lined upper and wanted my next build to be more of SPR (precision) type. The specs were exactly what I wanted. After purchase I continued researching and found a few negative reviews which BCM ultimately took care of. That was reassuring but I was still worried. Shipping was very fast (2days) and I loved all the extras (hat, stickers, slick gun grease, posters and a couple magazines to read). Upper was covered in oil. Fit and finish were perfect. After a break in period of 30 rounds (personal preference) I took it out to 100yards. Shooting 5 shot groups (xm855) without a bench my groups were tight and many shots were touching. I have no doubt with a bench, rest and some match ammo I'll have a MOA or better rifle.

  • 5
    SS410 18" Upper

    Posted by Matthew Holtgrieve on Oct 27th 2017

    Excellent craftsmanship. Fired it at the range last weekend and it operated flawlessly. Very happy with the 18" barrel.


  • 5

    Posted by Kurt kenehan on Oct 27th 2017

    Ordered this upper for an SPR build and It is perfect in the way I wanted it set up. The KMR rail really keeps the weight down while still having the SS410 medium profile barrel retains accuracy and durability over a longer period of fire. Had it ordered and within 3 days it was at my house put it together cannot be more happy with it. Fantastic service from Bravo Company as well as a fantastic product. Do not hesitate to pick up this upper if you are considering it.

  • 5
    Spectacular product, fast shipping,

    Posted by Ryan Wagner on Oct 22nd 2017

    Spectacular product, fast shipping, good customer service.

  • 5

    Posted by Jim Anderson on Sep 18th 2017

    Great upper.. finally had a chance to run some rounds thru it.. I'll be back soon for more uppers/components on all my new coming builds. Great company and product.