BCM® Standard 14.5" Mid Length Complete Upper Receiver Group w/ MCMR-13
(Color: Dark Bronze)

Product Description

Features

• Factory machined M4 feed ramps on the receiver with hard coat anodization adding significant strength to the aluminum
• USGI type laser etched T-marks to provide addressing for the remounting of tactical accessories such as optics, laser sights, etc
• Preferred USGI 1/7 twist rate effectively runs new heavier 5.56 ammo
• BCM barrel steel is Mil-Spec per MIL-B-11595E is stronger and will last longer than typical barrels offered in the commercial market
• Chrome lined bore and chamber is harder than the barrel steel and aids in chambering, extraction and reliability
• Barrrel manganese phosphate finish (Mil-Spec A-A-59267) creates a porous surface to absorb oil as to resist against corrosion from the elements
• The USGI barrel profiles enable the operator to carry their weapon for longer periods of time and deploy them faster
• HPT / MP inspected barrels
• MCMR free fload handguard eliminates loads from the barrel providing more accurate shooting
• Precision machined aerospace 6061-T6 aluminum alloy handguard with Mil-A-8625F, type 3, class 2 hard anodization
• Top Picatinny rail and M-LOK slots throughout

About the BCM® Standard 14.5" Mid Length Complete Upper Receiver w/ FDE MCMR-13 Handguard

All BCM® Upper Receiver Groups with a MCMR Handguard Include:

• One 3" Picatinny Rail Section
• One BCM MCMR Sling Mount

Handguards are Cerakoted in FDE. As with any paint process color variations will occur from batch to batch and the T-marks on the top rail will be covered.

Manufactured by Bravo Company MFG, Inc. (BCM)
These Barreled Upper Receiver Groups are designed for shooting professionals and responsible civilians 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 and Upper 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 upper receivers 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, private security personal, and personal defense for its superior ballistics.

Mil-Spec Barrel Steel (Certified Mil-B-11595E)
BCM barrel steel is Mil-Spec per MIL-B-11595E, and is independently certified. 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. This 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 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 or high quality personal defense ammunition.

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.

BCM® MCMR-13 (M-LOK® Compatible* Modular Rail)
Featuring the same industry leading barrel nut and lock up design as originally introduced on BCM's evolutionary KMR handguard, the MCMR Series of handguards gives the shooter modularity in the M-LOK platform.

This proprietary patented mounting system (US Patent 8904691), includes a mechanical index to the 12:00 rail and positions mounting hardware to mitigate the movement caused by heat generated by the weapon system.

• MCMR features M-LOK Compatible mounting system.
• Free Float Handguard eliminates loads from barrel, reducing the deflection for more accurate shooting.
• Precision Machined Aerospace 6061-T6 Aluminum Alloy, for high strength and lightweight.
• Proprietary engineered profile offers additional cross sectional strength.
• Steel Barrel Nut (same KMR, MCMR, and QRF series), to resist movement under heat.
• Hard Coat Anodized per Mil-A-8625F, Type III, Class 2
• Handguard alone weighs 8.2 oz
• Handguard mounting hardware 2.3 oz
• 1.3" Inside Diameter
• 1.5" Wide

Actual length when measured to flare is 13.4"

Designed to be used with pistol length, carbine length, mid length, or Mil-Spec M16 rifle length gas systems; all with a low profile gas block.

The barrel nut will fit over all mil-spec diameter barrels (max of 1")

Manufacturer: BCM

NOTE: NFA rules apply

Product Videos