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

MSRP: $1,042.95
Your Price: $830.95
(You save $212.00 )
(79 reviews)
SKU:
BCM-URG-18-SS410-KMR-A-15
Maximum Purchase:
5 units
Caliber:
5.56 NATO
Barrel Length:
18in
Barrel Style:
SS410
Handguard:
KMR-A15
Right hand side view of the BCM® SS410 18" Complete Upper Receiver w/ KMR-A15 Handguard 1/8 Twist.
Stock Status:

About the BCM® SS410 18" Rifle Complete Upper Receiver w/ KMR-A15 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 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.

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.***

79 Reviews

  • 5
    Love at 1st 100yard group

    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
    FANTASTIC UPPER

    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,

    Spectacular product, fast shipping, good customer service.

  • 5
    Awesome!

    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.

  • 5
    18" upper receiver

    I've only had a chance to run 60 rounds through this particular upper. So far no problems and as far as I can tell from just a function test of my home build. This upper is accurate and I hope to use it out past 300 yards. Assuming I can do my part.

  • 5
    Where o where has my upper gone?

    I recently purchased an upper from BCM. At first all went well until Fed Ex said my upper was delivered but it had not been. After a week of fighting with Fed Ex they finally told me there was nothing they could do. They suggested that I contact Bravo Company for help. BCM made it right in less than 24 hours! They shipped a new upper.

    Sadly you need to go through the process with Fed Ex before you can get real customer service from Bravo. I love the upper as it is high quality and puts rounds right where they need to be. Thanks Bravo Company!

  • 5
    18 inch upper

    best upper on the market
    everything was a breeze to assemble
    get the BCM lower kit too.

  • 5
    Quality components, solid build.

    Solid construction, superior quality upper from BCM. The 18" stainless barrel is as accurate as other reviews state. KRM alpha rail is super slim, and comfortable to grip, 15" looks great on the 18" barrel.

  • 5
    BCM Upper

    Love this upper. Absolutely I would recommend this upper to my friends and family or even random people that I meet at the shooting range. The recoil with that 18" barrel really helps with the kick back so I can proceed with a fallow up shot. Straight out of the box it was accurate. With my cheap sight mark red dot I was hitting targets easy at 200 yards with no problems.