BCM MK2 Mid-Length 16in ELW Complete Upper Receiver w/ 15in MCMR Handguard (Free BCG)

<p class="ql-align-justify">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, headspace, and test-fired.</p><p class="ql-align-justify">&nbsp;</p><p class="ql-align-justify"><strong>As a note:</strong>&nbsp;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.</p><p class="ql-align-justify"><br></p><h3 class="ql-align-justify"><strong>Featuring BCM’s Patent Pending MK2 Upper Receiver</strong></h3><p class="ql-align-justify">This proprietary design offers enhanced rigidity over the USGI product.&nbsp;The increased rigidity limits barrel deflection which aids in consistency/accuracy.&nbsp;&nbsp;Less flex also reduces premature damage, wear, and failure of bolt lugs from misalignment.&nbsp;&nbsp;A gas expansion chamber is machined above the charging handle track, combined with dual vents machined at the rear (each side, above the charging handle latch) to help to redirect and vent gas away the shooter's face.&nbsp;</p><p class="ql-align-justify"><br></p><h3 class="ql-align-justify"><strong>Cold Hammer Forged Barrels</strong></h3><p class="ql-align-justify">This process of manufacturing barrels has been used for European small arms for generations, and it is gaining popularity in the United States because of the increased barrel life and outstanding accuracy of a hammer-forged barrel. The BCM BFH series of barrels are made right here in the USA. (Just like all the BCM products.)</p><h3 class="ql-align-justify"><strong>M4 Feed Ramp Barrel Extension&nbsp;and Upper Receiver</strong></h3><p class="ql-align-justify">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.</p><p class="ql-align-justify">&nbsp;</p><p class="ql-align-justify">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.</p><p class="ql-align-justify"><br></p><h3 class="ql-align-justify"><strong>T-Marked Upper Receiver</strong></h3><p class="ql-align-justify">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.</p><h3 class="ql-align-justify"><strong>USGI 1/7 Twist Rate</strong></h3><p class="ql-align-justify">The USGI 1/7 twist rate of all of the BCM barrels is the preferred twist rate by most professional infantrymen. 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 personnel, and personal defense for its' superior ballistics.</p><h3 class="ql-align-justify"><strong>Mil-Spec Barrel Steel (Certified Mil-B-11595E)</strong></h3><p class="ql-align-justify">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.</p><h3 class="ql-align-justify"><strong>Chrome Bore and Chamber</strong></h3><p class="ql-align-justify">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 the chamber is harder than the barrel steel and will aid in chambering, extraction, and reliability. It increases velocity, and also resists 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.</p><h3 class="ql-align-justify"><strong>Manganese Phosphate Barrel Finish</strong></h3><p class="ql-align-justify">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 phosphate before the 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.</p><h3 class="ql-align-justify"><br></h3><p class="ql-align-justify">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.&nbsp;</p><h3 class="ql-align-justify"><br></h3><p class="ql-align-justify">Military specifications require that barrels undergo an 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.</p><p class="ql-align-justify">&nbsp;</p><p><br></p>

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