BCM® SS410 18" Rifle Complete Upper Receiver Group w/ QRF-12 Handguard 1/8 Twist

MSRP: $1,042.95
Your Price: $819.95
(You save $223.00 )
Maximum Purchase:
5 units
5.56 NATO
Barrel Length:
Barrel Style:
Stock Status:

Out of stock

About the BCM® SS410 18" Rifle Complete Upper Receiver w/ QRF-12 Handguard 1/8 Twist

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.***

6 Reviews

  • 5
    I LOVE this upper

    I was looking for a precision SPR-ish/DMR rifle and came across this upper. I paired it with a blem BCM lower for the complete package. Also, I took the A2 flash hider off and installed an Ops inc. collar and brake since the SS410 barrel is an MK 12 profile. With a Geissele SSA trigger and a quality bipod and of course good glass and you have an excellent DMR. I love BCM and my Recce 16 in burnt bronze now has a brother to keep him company in the safe... he's tired of hanging out with my Colts... LOL. Also, 1 MOA or better at 100 yards!

  • 5
    Good bye

    I wanted to build a mark 12 clone. The price was right , the quality was what I have come to expect from Bravo Co (3rd rifle) and 700 rounds into it not one malfunction. Awesome

  • 5
    Bravo has no Equal

    Bravo Company has always provided me excellent service. The products are of the highest quality. Whether for training, Leo, or personal defense I know I can always count on BCM products to be reliable

  • 5
    Great product, fast service

    My upper shipped next day after order and was recieved in less then a week. Matched perfect with my aero a2 lower and bcg and has a pretty good quality finish. Would definitely reccomend to a friend

  • 5

    I am very impressed with this upper. The first trip out I brought 50 rounds of a 68gr BTHP load I just pulled out of the Hornady book and some XM855 to zero the irons with. I was first taken aback that the junk XM855 wasn't flying all over the paper @ 50 yards. I'm not saying it shot a group but I only used around 5 or 6 rounds to hit the 1" pastey. I then threw my 1-4x on and took it out to 100 yards and fired off a quick 10 shot 1.5" group after zeroing followed by two 5 shot groups just over 1.25". Right then I knew that if it shot this well with a random load this upper was going to be a great shooter. Further load development has netted plenty of 1" to .75" 100 yard 5 shot groups with 62gr BTHP's. One more note on the barrel, it was not a Govt. profile as listed. It was an SPR/MK12 profile. Your's may vary but that is what I received. Love that QRF too.

    Outstanding job BCM. Keep it up.

  • 5

    Great and fast shipping. Quick processing.