BCM® SS410 18" Rifle Length Upper Receiver Group w/ Troy SDMR13" Handguard 1/8 Twist

MSRP: $977.90
Your Price: $812.90
(You save $165.00 )
(3 reviews) Write a Review
M4 Feed Ramp Barrel Extension (USGI)
5.56 NATO
Barrel Length:
Barrel Style:
Troy SDMR 13
Stock Status:

Out of stock

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Professional Grade Weaponry, by BCM®™
Made by Bravo Company MFG, Inc. (BCM®™) These Barreled Upper Receiver Groups are designed for shooting professionals with the Mil-Spec features for the demands of their duty. They are fully assembled, headspaced, and test fired.
As a note: BCM® barrel components are parkerized separately before assembly. 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.
These upper groups comes installed with the VTAC TRX 13" Handguard, barrel dimpled for strong install of Low Profile Gas Block.


BCM® SS410 Barrels
This BCM® stripped barrel is machined from a 410 stainless steel. It features hand lapped button rifling with a 1/8 twist rate and M4 feedramps. To give the shooter the best balance of weight and accuracy this BCM® barrel has a mid-weight profile and a rifle length gas system.
(410 stainless is a harder and more corrosion resistant than the conventional 416 stainless found in most barrels.)


M4 Feed Ramp Barrel Extension
M4 Feed Ramp Flat Top 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® uppers 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.
Copyright © 2005-2010 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.***

3 Reviews

  • 5
    Outstanding Upper!

    Posted by M14 Guy on May 4th 2016

    Lightning fast shipping. Quality and workmanship are outstanding. Love the hand guard and the upper mated perfectly with my Spikes lower. My total weight with optic came in at just over 8#. Using Black Hills 77 grain I saw 3/4 MOA with a Vortex 1-6X Strike Eagle scope and that was with just 20 rounds thru it! Next outing will more ammo eval. I think this upper still has more to show. If you're going to build a SPR you would do well to consider this upper. I could not be more pleased. Thank you BCM!

  • 5

    Posted by anonymous on Dec 15th 2015

    Great product. Got here a day earlier that expected. Excited to go use it asap

  • 5
    First BCM purchase

    Posted by Jackie Wilson on Nov 6th 2015

    Was very inpressed with packaging, and de livery time, the product was in exxcellent conditioned as described on wed site. Will deffinitely purchase again from this company.