As a result we have a ton of quad rail handguards like the CAA-Tactical Handguard w/Picatinny Quadrail Set for the AK or the BLACKHAWK AR15 Carbine Length 2Pc Quad Rail that doesn’t even feel the need to tell you it’s a Picatinny rail system. Having one uniform system is a great advantage because all of your accessories can be mounted anywhere you have a rail. For the most part, few people will need to worry about this because if you are buying any tactical rails or accessories they will be Picatinny. 206 inches wide on a MIL-STD-1913 (Picatinny) rail and only. The easiest way to tell them apart is that the grooves that hold things in place are. It is important to now which rail system you have and what accessories you own designed for it. CAA Tactical Handguard with Picatinny Quadrail Set Items designed to fit a Weaver rail will generally fit a Picatinny Rail, but the inverse is not usually the case. This rail system is standardized and has consistent spacing, and while Weaver and Picatinny may look the same the dimensions are different. It is sometimes referred to by its official title of MIL-STD-1913. This later system was developed for military use in the mid-1990s. The first rail system developed for optics was the Weaver system and you still see it advertised today, however it has been in large part replaced by the Picatinny rail system. And if you wanted to get tactical by adding a flashlight to your rifle, Duct Tape (Bill Murray style) was your only option. Also, many rail-mounted accessories come with only a single recoil pin – avoiding the issue of differing slot spacing.In the bad old days if you wanted to add an optic to your rifle you had to take it to a gunsmith who drilled and tapped the receiver in order to install scope rings. 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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