About the BCM® SS410 16" Mid Length Complete Upper Receiver w/ PRI 12" NATURAL Handguard 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.
These upper groups comes installed with the PRI Gen III 12" Natural Carbon Fiber Finish 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 mid-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 & 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.
PRI Gen III 12.0" Handguard
The Latest PRI Gen III AR15/M16 Freefloat Forearm and barrel nut are constructed of light weight high strength carbon fiber, aluminum and high strength steel for the best possible combination of weight and strength. The carbon fiber also reduces the amount of heat transferred to the shooter's hand during rapid or high volume firing. The long top rail matches the height of the top rail on the standard flattop receiver and is compatiable with the ARMS family of rails. The most rigid M16 freefloat system available is now easier to install. The forearm weighs 1 lbs. with an internal diameter of 1 3/4" at the open end of the tube. The overall length of the forearm is 12 1/2". SPR* is a registered trademark of ArmaLite Inc. and is used under license agreement.
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