308 Win with 20" Heavy Barrel with 5/8-24 Threaded Muzzle. Shipped with Thread Protector Installed. Accepts AAC and other 5/8-24 Threaded Flash Hiders, Muzzle Brake and Suppressors. 1 in 10 Rate of Twist for increased bullet stability. Hogue Overmolded Ghillie Green Pillar Bedded Stock. X-Mark Pro Externally Adjustable Trigger Set at 3 Pounds.