This model of the standard rifle is chambered in.17 hmr, and features a black finish.It has an 18" barrel with an a2 flash hider muzzle device, and has a twist rate of 1:9".It features a tacstar carbon fiber handguard, m4 stock, and a velocity 3lb trigger.Action: Semi-AutoCaliber: 17 HMRBarrel Length: 18"Capacity: 10+1Oal: 37"Weight: 6.61 lbsStock Description: M4Twist: 1:9"Muzzle: A2 Flash HiderBarrel Length Range: 18" to 18.99"Weight Range: 6 lbs to 6.99 lbs