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Picatinny Rail Specs

This is a simplistic drawing of the Mil Spec M1913 Picatinny Rail cross section. There are many rails available that are sold as Picatinny but do not meet the military specification. All of the interface problems experienced with accessories are the result of poor manufacturing. When an accessory is designed with the proper clearances and manufactured with the correct tolerances there will be zero fitment issues with true Picatinny rails.