The Impact 707 action features a round profile with integral recoil lug, and screwed and pinned aluminum 20 moa picatnny rail.  It utilizes the same trigger hanger system, and is interchangeable in bolts and barrels with the 737 and NBK actions.  This is a short action with a bolt for standard cartridges such as .308 Win, 6 and 6.5 Creedmoor, 6 Dasher, BR, 6GT, 6.5x47, etc.