Warsaw Pact rail, is a rail mount system to connect telescopic sights to rifles.Many accessories can be secured to a rail with a single spring-loaded retaining pin. From May 2012, most mounting rails are cut to Picatinny standards. While some accessories are designed to fit on both Weaver and Picatinny rails, 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. After it was determined that the new rail should be a standard, not a specification, it was adopted and fielded in 1995 with the designation Mil-STD-1913, dated February 3, 1995. The team then sent the finished product over to Rock Island Arsenal for review and trial, and then to the technical data section to determine if it should be a standard or a specification. The factory recognized the similarity of the purposed optics rail to the existing rail design on 105 mmhowitzers, so they chose to scale down the howitzer rail design and co-opted the production and inspection procedures. Houtsma then took the specifications over to the production facility and requested they design a dimensioning style so the rail could be easily produced and inspected. The Picatinny team was headed by mechanical designer Gary Houtsma (who was awarded the Order of Saint Maurice Award in 2014 for this contribution ), who took the measurements from 20 or so different Weaver rail products from weapons bunkers at Picatinny (and even sporting goods stores) and came up with an average set of numbers set on a 45-degree angled surface. Army was dissatisfied with the contemporary products on the market. The rail is named after the Picatinny Arsenal in New Jersey, which was tasked in 1992 to develop a standardized mounting system after the U.S.
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