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.