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1 in 8 Barrel Twist rate, Bushmaster lists weight as 7.75lbs as configured and this rifle has an AR-15 BCG.,

1:8 twist and 7.75 lbs see *** Specifications and Features: Bushmaster XM-15 3-Gun Basic 90898 AR15 Semi Automatic Rifle Direct Impingement Mid-Length Gas System 5.56 NATO accepts .223 Remington 30 Rounds ********16" 416 Stainless Steel Barrel with 1:8 Twist Melonite Treated with Threaded Muzzle 1/2x28 TPI AAC 51T Blackout Flash Hider/Suppressor Adapter Mil-Spec Forged Aluminum Flattop Upper Receiver Mil-Spec Forged Aluminum Lower Receiver Two Stage Trigger with Enhanced Trigger Guard 15" Barnes Precision Modular Handguard Magpul MOE Collapsible Stock Magpul MOE Pistol Grip Black Anodized Finish Overall Length 33.5" ******Weight 7.75 lbs I suggest verifying this with Bushmaster https.//www.bushmaster.com/contact