The CRS action (Competitive Rifle Sports) is a short action with an extended magazine port. It has additional clearance on both front and rear of the port which makes it ideal for aftermarket magazines.As with all Kauger Arms competition actions, the CRS action is fully nitrided and features our extremely smooth competition bolt. FeaturesPinned Bolt HeadSliding Plate ExtractorBayonet Style 1/4 Turn Bolt Shroud7/32" Pinned and Hooded Recoil LugBDL Internal Mag or AICS, AW Style Magazines90deg Bolt Throw