![]() ![]() However, none of these early attempts fully met the U.S. The industry’s first attempts to modernize the Weaver rail started in the early 1980s, with A.R.M.S., Inc. developing the original dovetail dimensions that would later become Picatinny rails. The Picatinny rail’s primary purpose is to allow military firearms to attach scopes, but the system was later adapted for compatibility with a wide array of attachments. The Picatinny rail is the common name for the MIL-STD-1913 rail interface system. Despite that, Weaver rails served as the base in the development of the Picatinny rail. The inconsistent slot position between each rail made it impossible to ensure that every accessory could be installed consistently on each rail. Shooters at the time considered Weaver rails to be inferior they were less durable and impossible to adjust for windage. Weaver rails competed with Leupold’s Redfield mounting systems. ![]() The slots’ position on a Weaver rail is not standardized each rail may differ from the next. Accessories intended for Weaver rails typically feature locking screws designed to interface with the slots, allowing the user to tighten the accessory in place. This company is responsible for creating the first attempt at a universal scope mounting system for rifles: the Weaver rail.Ī Weaver rail consists of a metal rail with teeth and slots, being approximately 0.180” wide. The William Ralph Weaver Company was a manufacturer of rifle sights and scope systems founded in 1930. Also, many rail-mounted accessories come with only a single recoil pin – avoiding the issue of differing slot spacing.Before the Weaver rail, scopes and attachments were more or less proprietary to each firearm, employing attachment points such as dovetail mounts. As of May 2012, however, most mounting rails are cut to Picatinny standards, and many accessories come with the recoil pin cut to the Weaver-compatible diameter. Some accessories are designed to fit on both Weaver and Picatinny rails but most Picatinny devices will not fit on Weaver rails. Weaver rails have a slot width of 0.180 in (4.57 mm), but are not necessarily consistent in the spacing of slot centers. The only differences between the Picatinny rail and the similar Weaver rail are the size of these slots and the fact that they are standardized. The spacing of slot centers is 0.394 in (10.01 mm) and the slot depth is 0.118 in (3.00 mm). The Picatinny locking slot width is 0.206 in (5.23 mm). Their usefulness has led to their being used even in paintball and airsoft. The Picatinny rail was originally for mounting scopes atop the receivers of larger caliber rifles, but, once established, its use so expanded to other such accessories as tactical lights, laser aiming modules, night vision devices, reflex sights, foregrips, bipods, and bayonets that Picatinny rails and accessories have replaced iron sights in the design of many firearms, and they are also on the undersides of semi-automatic pistol frames and grips. The Heckler & Koch HK416 is equipped with a proprietary accessory rail handguard with MIL-STD-1913 rails on all four sides, used here to mount a vertical foregrip and Aimpoint CompM4 red dot sight This was Mil-STD-1913, dated 3 February 1995. The Picatinny Arsenal's role with the rail was to test/evaluate it and to create a military standard for it. The rail is named after the Picatinny Arsenal in New Jersey. These were the M16A2 and the M4 modified with new upper receivers where rails replaced hand guards. Specifications for the M16A2E4 rifle and the M4E1 carbine received type classification generic in December 1994. company in the early 1980s and Otto Repa in standardizing the Weaver design. The rail itself dates from work by the A.R.M.S. The rail consists of a series of ridges with a T-shaped cross-section interspersed with flat "spacing slots." Accessories are mounted either by sliding them on from one end or the other by means of a Weaver mount which is clamped to the rail with bolts, thumbscrews or levers or onto the slots between the raised sections. ![]()
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