Kauger Arms actions are made to be as accurate and smooth as possible. The bolt utilizes a gas shield for safety and incidentally gives the bolt more surface which makes it extremely smooth. The bore and face are machined in one operation and are perfectly true to one another, so there is no need for refacing by a gun smith. Threaded for 1 1/16" - 16 barrel. Features#80-40 Scope Mounting Threads0.62" Diameter Firing PinPinned Bolt HeadSliding Plate ExtractorBayonet Style 1/4 Turn Bolt Shroud7/32" Thick Pinned and Hooded Recoil Lug90deg Bolt ThrowWorks with BDL Internal, AICS, and AW Magazines