BCM® Standard 12.5" Carbine Upper Receiver Group

MSRP: $620.40
Your Price: $510.40
(You save $110.00 )
SKU:
BCM-URG-M4-12
Caliber:
5.56 NATO
Barrel Length:
12.5in
Barrel Style:
Standard
Stock Status:

Out of stock

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Please check back with our website often, we can not take pre-orders or backorders on these products.
 
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.***

18 Reviews

  • 5
    Upper

    Great product

  • 5
    Customer review

    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

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

  • 5
    Very light

    Haven't had the opportunity to zero in the rifle yet. But based off of first impressions I'm in love. Very light weight, professional grade quality right out the box. Very satisfied with my first purchase from this company. Looking forward to more purchases in the future.

  • 5
    Customer review

    Super product at a great price from a great company. Not sure how Wisconsin managed to justify sales tax for a Virginia purchase but so be it. Will be looking for a local retailer. Lesson learned.

  • 5
    12.5” Upper Receiver Group

    Accurate and reliable, with the typical BCM build quality and attention to detail.

  • 5
    I trust it..

    Went with the 12.5, more for the balance than anything else. Finish is excellent, but if you really care about the finish then stop reading. Paired this upper with a Colt lower/BCG and the fit was perfect. If I gotta take 1 rifle and go, she's the one.

  • 5
    Great quality

    This is the second complete upper I have purchased from BCM and the procts are always of great quality. I put this on a complete BCM pistol lower wich is also a great product. I only have one complaint. I bought the 12.5" with the intention of mounting an AEM5 suppressor, but the barrel diameter is too large. When I contacted BCM for more information they responded quickly, but never responded to my follow up question. This has been uncharacteristic of BCM in my experience.

  • 5
    Incredible upper. Incredible service.

    This is my 3rd BCM upper and it won't be my last. Yawn-inducing reliability and exceptional quality.