BCM® SS410 16" Mid Length Complete Upper Receiver Group 1/8 Twist

MSRP: $779.00
Your Price: $644.00
(You save $135.00 )
Maximum Purchase:
5 units
M4 Feed Ramp Barrel Extension
5.56 NATO
Barrel Length:
Barrel Style:
Stock Status:

Out of stock

About the BCM® SS410 16" Mid Length Complete Upper Receiver, 1/8 Twist

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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.

M4 Feed Ramp Flat Top Receiver & Barrel Extension

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.

USGI 1/8 Twist Rate

The USGI 1/8 twist rate of all BCM® Stainless barrels is the preferred twist rate by the DoD and most professional infantryman. This twist rate has proven very versatile and can effectively run the new heavier 5.56 ammo that is hugely popular with military and private security personal for its superior ballistics.

Mil-Spec SS410 Barrel Steel

This 16" 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 precision barrels

5.56 NATO Chambers

The USGI 5.56 NATO chamber is the best choice for effective deployment, reliability, and compatibility, of higher chamber pressures of military ammo.

Mil-Spec F-Marked Forged Front Sight Bases

Mil-Spec for rifles issued to the troops require taller front sight bases on all flat top AR rifles. Many commercial offerings use M16A2 height front sight bases on all of their barrels regardless of what type of upper it is installed on. As a result, owners of rifles and carbines with the flat top receiver configuration can have problems getting a proper 'zero' for elevation with Mil-Spec back up iron sights. As all of the BCM® uppers are built for flat top uppers, all have the proper Mil-Spec F marked front sight base to insure the correct height for iron sight zeroing when using military iron sights. Mil-Spec taper pins secure the forged front sight base with the sling swivel secured by tubular rivets.

Government Barrel Profiles

Duty rifles are built to be carried - day in and day out. The USGI barrel profiles (often referred to as the Government Profile) enable the operator to carry their weapon for longer periods of time and deploy them faster than the heavier commercial H-Barrel counterparts. The government profile barrel is also compatible with the current M203 mounting systems.

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.***

19 Reviews

  • 3
    Be more clear on end caps

    You need to be clear that you put triangular end caps instead of round. As you know magpul SL handguards need a round end cap. Now I need to remove the gas block switch out end caps. Just a pain in the ass. When I finish the build and it groups well I’ll be happy but at this point I am slightly annoyed.

  • 5
    Great Company

    Thank you for the timely email responses and fast shipping. I’m extremely satisfied with the product, also very high quality. Received additional gear and goodies with my order, definitely a pleasant surprise. Will definitely be a returning customer!

  • 5
    BCM SS410 16" Mid Length Upper 1/8

    Another excellent upper from BCM, sub MOA
    with 69gr and 77gr OTM

  • 5
    BCM SS410 16" Mid Length Upper Receiver Group

    I recently purchased the "BCM SS410 16" Mid Length Upper Receiver Group" for my complete 300BLK rifle. I have been waiting for a 1:8 twist BCM "nekid" upper for sometime. The 1:7 twist has been available, but I am wanting to shoot mostly 55gr. The upper came in a matter of days and was shipped with lots of "goodies" including a Trucker hat that I would have gladly paid for ;)

    I am so thrilled with the quality and presentation of my product. My only wish is that they sold it in a 14.5 length barrel!

  • 5
    Can't wait to finish my build.

    With this being my first build I, wanted something of quality and performance I, did extensive research online and for what I heard by word of mouth and the reviews BMC was a no-brainer the quality of this upper group is superb,
    for my next build believe me when I say that it'll be my BMC.
    Oh and thank you BMC for the freebies!

  • 4
    Almost perfect

    This is a great upper. I'm thoroughly impressed with the groupings im getting out of it. My only issue is that it comes from BCM with a triangular handguard plate instead of a round one. despite the fact you can select your BCG, charging handle preference, muzzle device, and handguard you can't request a round plate.

    It took some sweat and time and a big hammer to swap the parts out myself and then some fiddling to make sure the front sight base was reinstalled correctly but it seems perfect now. It should be more like 4.5/5

  • 5

    Fit and finish are first class. The 16" medium weight stainless barrel balances smartly with a Magpul MOE rifle stock. An updated review with range report to follow...

  • 5
    good stuff

    Put this product on-hand it has worked fantasicly no problems excellent quality

  • 5
    BCM SS416 16"

    Excellent service, fast shipping and a quality product.