Atlas 1913 Rails serve as attachment points for Atlas Bipods that fit Picatinny rails. 3.35" rail accommodates hole patterns with 1.76" to 2.78" center-to-center spacing and fits onto curved surfaces. 4" rail accommodates hole patterns with 2.2" to 3.5" center-to-center spacing and fits onto flat surfaces. Rails attach to the stock with either a sling stud and spacer or machine screws, (not included).
Bipod Rail Mounting Fasteners fit into stocks without sling studs or mounting positions, and provide sockets and screws to accept sling studs and to attach Picatinny rail sections directly. Allows you position the sockets anywhere or to create any hole spacing you want. Requires drilling and must be installed by a competent gunsmith.