XBRN16E1 Rifle Caliber: 5.56 NATO. Detailed reproduction of the first AR-style rifle issued to ground troops during the early years of the Vietnam War. With forward assist, black triangle handguard, and three-prong flash hider. The gun is constructed with all new-production parts. Length: 40 in. Weight: 6.8 lbs. A1-style sights, 1:12 rate of twist, gray-anodized receiver. As of 2022, only available as a build kit, not as a complete rifle.