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  BCM Standard 20" Government Profile Upper Receiver Group

BCM M16 Government 20 Upper Receiver Group
BCM® Government 20 Upper Receiver Group

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List Price: $539.00
Our Price: $439.00
You save $100.00!

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Product Code: BCM-URG-GOV-20

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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.
M4 Feed Ramp Barrel Extension (USGI)
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.
USGI 1/7 Twist Rate
The USGI 1/7 twist rate of all of the BCM barrels is the preferred twist rate by 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 11595E - Barrel Steel
BCM barrel steel is Mil-Spec per MIL-B-11595E. This grade (CMV) of steel is a Mil-Spec steel used in the USGI M16 family of rifles; it is stronger and will last longer than the typical barrels offered in the commercial market. The Mil-Spec grade steel gets its’ additional strength and rigidity from an increase in carbon and/or vanadium in the alloy. This will offer increased barrel life and performance through use in all types of extreme environments and temperatures.
Chrome Bore and Chamber
One of the first modifications that were made to the original M16 in the mid 1960’s was the addition of the chrome lined bore and chamber. It is now a worldwide standard in the industry for a battle rifle. The chrome bore and chamber is harder than the barrel steel and on the USGI M16/M4 rifles will aid in chambering, extraction, and reliability. It increases velocity, and also resist against fouling and corrosion from extended use in the field. This gives the end user a longer barrel life with less required time in maintenance and cleaning.
Manganese Phosphate Barrel Finish
Barrels are parkerized with the manganese phosphate finish (Mil-Spec A-A-59267). Military specifications also state that the entire barrel surface is phosphate finished to create a porous surface to absorb oil as to resist against corrosion from the elements. BCM barrels are phosphated before installation of front sights. This is a much more extensive assembly operation, but insures that the entire barrel is finished and protected . . .even under the front sight base.
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.
HPT / MP Inspected Barrels
Military specifications require that barrels undergo a HPT (High-Pressure Test) load as a part of quality assurance procedures. Commonly referred to as a proof load, the M197 HPT is rated for 70,000 psi. BCM barrels are proof loaded and then MPI (Magnetic Particle Inspected) to detect any possible flaws in the barrels surface. The barrels are MP inspected with both circular and longitudinal magnetic fields per ASTME1444-01 (current Mil-Spec) to assure a high quality finished product. All BCM barrels are marked HP MP as our proof load marking.
Copyright © 2005 - 2009 Bravo Company MFG, Inc.
  • M4 Feed Ramp Barrel Extension
    M4 Feed Ramp Flat Top Receiver
    T-Marked Upper Receivers
    USGI 1/7 Twist Rates
    USGI 5.56 NATO Chambers
    Mil-Spec 11595E - Certified Barrel Steel (CMV)
    Chrome Lined Bore and Chamber
    Manganese Phosphate Barrel Finish
    Mil-Spec F-Marked Forged Front Sights
    USGI Government Profile Barrels
    HPT (High Pressure Test) Barrels
    MPI (Magnetic Particle Inspected) Barrels

Average Customer Review: 5 of 5 | Total Reviews: 40 Write a review.

  0 of 0 people found the following review helpful:
WOW November 30, 2015
Reviewer: Joseph Ritchie from Ruskin, FL United States  
This is my first BCM experience and I have to say the quality is as advertised. BCM makes a GREAT product. This is easily one of the nicest uppers I own and I have put some money into these builds. I like that they threw in 5 posters, a hat, a calendar, stickers and all kinds of other stuff just as free extras. Will become a long time customer because they have the right quality/price point!

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  0 of 0 people found the following review helpful:
OH YEAH!!!! November 23, 2015
Reviewer: John Roberts  
I am so stoked about this new upper. Just picking it up, the thing oozes quality.  And is it just me, or are most of the 20" A4 uppers 1 in 9 twist?  Much rather have a 1 in 7.   Can't wait to get this thing to the range!

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  0 of 0 people found the following review helpful:
Everything I wanted! November 21, 2015
Reviewer: Clayton from Arkansas  
Finish is top notch. No malfunctions of any kind. Shipped on a Wednesday, was at my door on Friday. Also included a BCM hat, tons of decals and stickers, posters, calendar and gun lubricant. Top quality and service as always from BCM. Customer for life.

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  0 of 0 people found the following review helpful:
Excellent November 11, 2015
Reviewer: Kyle from SC, United States  
Built a m16a4 clone with this, excellent build quality as you should expect from BCM. I've had no reliability issues thus far and accuracy is great. I definitely recommend this upper group.

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  0 of 0 people found the following review helpful:
You get what you pay for November 11, 2015
Reviewer: Adam Quinn from Pittsburgh, PA United States  
It's plain and simple,  if you want to rely on your rifle , you'll buy quality. In this case quality comes at an affordable price tag. the components on this upper are up to BCM quality , everything is torqued to spec and staked properly. The finish is unflawed. If you want a toy you can buy low end, but if you're looking for a tool to be counted on then look no further.

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