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The Picatinny rail ( or ), also known as a MIL-STD-1913 rail, Standardization Agreement 2324 rail, or tactical rail, is a bracket on some firearms that provides a standard mounting platform consisting of rails with multiple transverse slots similar in concept to to the earlier commercial Weaver rail mount used to mount telescopic sights. Whereas the earlier Weaver design is based on a low wide dovetail the Picatinny variation has a more pronounced angular section. Designed to mount heavy sights of various kinds a great variety of accessories and attachments are now available and the rails are no longer confined to the rear upper surface (receiver) of long arms but are either fitted to or machine milled into the upper, side and lower surfaces of all manner of weapons from crossbows via pistols and long arms up to an including anti-materiel rifles. Accessories - which can include vertical 'tool' or 'pistol' grips; bipods and rests; electro-optical sights including image intensifiers; flashlights and laser sights - can be mounted by sliding into place (or if already fitted with a Weaver mount clamped to the rail), thus providing backward (one-way) compatibility with any items already provided with Weaver-type mounts. == Design == As mentioned the rail consists of a precision crafted strip undercut to form a flattened T cross-section provided with crosswise slots at intervals interspersed with flats that allow accessories to be slid into place from the end of the rail then locked in place; slid into the slots between raised flats then moved a shot distance back or forth or clamped to the rail with bolts, thumbscrews or levers (as per the Weaver system). The Picatinny locking slot width is . The spacing of slot centers is and the slot depth is .〔 The only significant difference between the Picatinny rail and the similar Weaver rail are the size of these slots and the fact that they are standardized. (Weaver rails have a slot width of , but are not necessarily consistent in the spacing of slot centers.〔(Brownells – World's Largest Supplier of Firearm Accessories and Gunsmithing Tools )〕 As already mentioned while some accessories are designed to fit on both Weaver and Picatinny rails most Picatinny devices will not fit on Weaver rails but from May 2012 most mounting rails are cut to Picatinny standards and as many shooting accessories can be fitted with just a single recoil pin this obviates issues of incompatible slot spacing.) 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Picatinny rail」の詳細全文を読む スポンサード リンク
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