BCM® Standard 12.5" Carbine Upper Receiver Group

MSRP: $564.00
Your Price: $464.00
(You save $100.00 )
(11 reviews) Write a Review
SKU:
BCM-URG-M4-12

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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
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 - 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.***

11 Reviews

  • 5
    Customer review

    Posted by anonymous on Apr 10th 2019

    I have researched and received input from friends that own BCM uppers. It's the same thing I hear, BCM uppers are the shit you want, the best shit out on market. So l bought my upper and yes BCM uppers are squared away. My upper l use for work and pleasure. I plan on buying another upper in the future.

  • 4
    Good option

    Posted by Jose caramba on Apr 9th 2019

    No problems with product
    Appears good quality upper
    Not a fan of communication only via e-mail

  • 5
    Noel

    Posted by Noel on Sep 22nd 2016

    Great build quality on this upper. Attention to detail was exceptional like the polished M-4 feed ramps. Absolutely recommend it to anyone building a Colt Commando clone or AR pistol.

  • 5
    Phenomenal upper

    Posted by Alex on Sep 22nd 2016

    I've already put close to 1,000 rounds through it and haven't had an issue. Great BCM quality!

  • 5
    12.5

    Posted by adam Ramirez on Sep 22nd 2016

    Great looking and proformence is outstanding love all bcm has to offer. I do so much I bought 3 uppers very happy

  • 5
    Excellent As Always

    Posted by M.B. on Jun 10th 2016

    BCM is the standard to which the industry should be measured. Quality products and craftsmanship with fast shipping. They will always have my business. Perfect setup for my XM177e2 Clone.

  • 5
    12.5" Upper Receiver Group

    Posted by Jonah Yue on May 2nd 2016

    Usual BCM quality!!!

  • 2
    a little bummed out

    Posted by Brian Fitch on Dec 22nd 2015

    I received my order yesterday to find that the bcm bcg that was with my upper came without the gas key staked at all. I've tried sending multiple emails but they keep failing to send. Please contact me at [email protected] so I can get a properly staked and usable gas key and bcg. Thank you.

  • 5
    Outstanding Performance in a compact package

    Posted by William Williams on Nov 11th 2015

    Quality of this upper is out of this world. I used it in an EAG three day class without a single hitch. Three days and over 1000 rounds down range with perfect performance and the accuracy is unbelievable. When confirming zero at 50 yards it shot a five round ragged hole. This is why I just ordered another BCM upper.