About the BCM® MK2 KD4 Spec Complete Upper Receiver w/ MCMR-13
Featuring BCM’s Patented MK2 Upper Receiver
This proprietary design offers enhanced rigidity over the USGI product. The increased rigidity limits barrel deflection which aids in consistency/accuracy. Less flex also reduces premature damage, wear, and failure of bolt lugs from misalignment. A gas expansion chamber is machined above the charging handle track, combined with dual vents machined at the rear (each side, above charging handle latch) help to redirect and vent gas away the shooters face. U.S. Patent Numbers: 10670355, 10677549, D888182
KD4 Upper Group with twist rate designed for 77 grain Black Hills ammunition.
Upper Group features the BCM® SS410 16" Mid Length Upper Receiver Group w/ BCM® MCMR-13 Handguard, 1/7.7 Twist Ionbond Finish on barrel.
"Black Hills Ammunition has been making the most accurate and lethal 5.56 cartridges for years. In particular, their 77 grain OTM or MK 262 variants as its known in the military has performed without fail for over 20 years. I have used it myself and consider it lifesaving equipment.
As a military sniper I came into service when BH 77 grain was gaining favor with my community and also when my community began the concept of what's now known as the MK 12 5.56 light sniper rifle.
Over the years and through many rounds, testing and evaluations I, along with others, discovered that a twist rate of 1/7.7 is the absolute best for optimizing performance from Black Hills 77 grain ammunition. Now thanks to BCM® anyone can buy a complete upper tailor made for use with BH 77 grain variants."
Kyle Defoor
June 2017
About Kyle Defoor
Kyle Defoor is a professional shooter who teaches firearms and tactics to military, law enforcement, and civilians. Specializing in pistol, carbine, urban sniper, and CQB, Kyle gained his knowledge from decorated combat service in multiple war fronts as a special operator and as one of the first and premier tactical trainers in the world. An active motorcyclist, hunter, climber, runner, and waterman he can be seen on multiple TV shows, magazines, websites, and on ranges worldwide.
Please visit Defoor Proformance Shooting
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