Action: Bolt - Caliber: 308 Winchester - Capacity: 4 + 1 - Barrel Length: 20 Heavy Barrel - twist: 1:10 - Trigger: X-Mark Pro - Safety: Thumb - Overall Length: 39.63 - Stock: Hogue OverMolded - Finish: Black - The Model 700 SPS Tactical AAC SD Rifle features 308 Win with 20 Heavy Barrel with 5/8-24 Threaded Muzzle. Shipped with Thread Protector Installed. Accepts AAC and all 5/8-24 Threaded Flash Hider Muzzle Brake and Suppressor. 1 in 10 Rate of Twist for 168 grain-220 grain Bullets and Sub-Sonic Loads. Hogue Overmolded Ghillie Green Pillar Bedded Stock. X-Mark Pro Externally Adjustable Trigger Set at 3 1/2 Pounds.