The M2 machine gun is one of the world's most reliable, highly accurate and effective weapons. General Dynamics Ordnance & Tactical Systems developed the M2A1 .50 caliber weapon after more than 30 years of experience manufacturing the M2 heavy barrel (HB) machine gun for the U.S. Department of Defense. The M2A1 offers the proven performance and in-place logistics support of the existing M2HB machine gun, along with the new features and design improvements of the quick change barrel (QCB) system and flash hider. These upgrades increase the performance of the battle-proven M2 and are adaptable to existing M2HB weapons. KEY FEATURES Fixed headspace and timing Reduces safety concerns associated with barrel changing. Simplify warfighter training Eliminates operator requirement to adjust the headspace and timing. Positive barrel engagement Ensures the barrel is securely locked and aligned with the patented J-slot barrel retention system. Improved flash hider Decreases muzzle flash, making the M2 night-vision friendly. Robust, removable barrel handle Streamlines hot-barrel changing. Fan Funding : PayPal : arronlee33@hotmail.com. Thanks a lot for your support! :-)