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
    BCM upper

    Love this guy. Ordered it the next day it was shipped. This guys are great.

  • 5
    Wow..beyond expectations.

    First I must commend BCM for the best shipping ever experienced. Ordered late afternoon Monday, had it on Friday. Fit and finish is better than expected, an absolutely beautiful upper. I promised my son a rifle when he was on his 2nd deployment in AFG. Built the lower myself. A few more additions to the project and I can keep my promise to him. Thank you BCM

  • 5
    Love it

    Bravo rocks

  • 5
    Transforming a so-so AR into my Dream Gun

    I bought this upper to mount on an old A2 style Olympic Arms AR, to transform it into a sniper rifle. It fits and functions perfectly, and seems to be more accurate than my shooting skills at present. I'm looking forward to sighting in the Lucid 4-16X44 scope I mounted on it, and practicing to improve my shooting skills in the hope of finding out what this upper can REALLY do! It appears to be a true sub-MOA upper.

  • 5
    18" Rifle Upper Group w/ BCM KMR Alpha

    Great gun for a great price. Everything shipped fast. Fit my lower like a glove.

  • 5
    Looks good, Can't wait to shoot it!

    Arrived on time as promised. Installed easily. Added ACOG with quick mount. Awaiting arrival of bi-pod and 2 point sling. Can't wait to shoot it!!!

  • 5
    Bcm 18 upper

    Put 200 rounds so far so good.

  • 5
    BCM 18" rifle upper

    Great looking and great quality receiver. It fit well with the Palmetto State Armory receiver I used in the build. Now I just need to get to the range!

  • 5
    Very nice!

    I bought it w/BCG & Large handle. It's replacing a DPMS 16" barrel w/carbine gas upper. I tested 5.56 55gr., 62gr., .223 55gr., 62 gr., & 75gr. I tried both cheapo and premium ammo. There were no failures anywhere at anytime from any part of the weapon. I got better groups with the American Eagle 55gr ammo. All groups were a 300%-400% improvement. This upper is MOA at least. The recoil is softer than a carbine system. I went with a 4.4oz H2 buffer in a carbine tube. I noticed the gas block was set forward of the stop grove by 1.5mm. I took a snapshot & e-mailed BCM. Tech support assured me this is normal. The DPMS is fine for what it is. But this upper is more accurate. This upper mated perfectly to the lower. I also installed a match-grade trigger. The key-mod rails works well and there are adapters for M-lock & picatinny items. The rails are narrow & very comfortable. I can't really say anything bad about this upper. I'm not being compensated for this review.