Caliber: 6.5 Creedmoor, 7.62 NATO. Mod 2.6 large-frame rifles have URX6 handguard system, and lower receiver has ambi functionally mirrored bolt catch and release. A2 in 7.62 NATO has 20” barrel, 1:10″ twist. Weight: 9.42 lbs. Length: 38.5” to 42”. K3 similar to A2 but with 16” barrel. Weight: 8.7 lbs. Length: 34.5” to 38″. A3 in 6.5 CM has 22” barrel, 1:7.5” twist. Weight: 9.89 lbs. Length: 40.5” to 44”. K6 in 6.5 Creedmoor has 16” 5R cut-rifled 416R stainless barrel, 1:7.5″ twist, dimpled for reduced poundage. Weight: 8.9 lbs. Length: 34.5” to 38”. Values are for the A2 7.62 NATO (20”), subtract 6% for the K3 7.62 NATO (16”) variant; subtract 3% for the K6 6.5 CM (16”) model; and add 6% for the A3 6.5 CM (22”) variant.