question bête ... au sujet des rails

par Invité Jeu 24 Mar 2011 - 19:26

Bonjour à tous

Excusez ma question peu être idiote, mais y a t il des normes, un standard pour les rail picatiny ?

Sur ma RS1 c'est quoi le rail ? truc monté par FMR d'origine

Merci

par laffouine Jeu 24 Mar 2011 - 19:43

Oui, il y a des normes pour les rails pica, et aussi pour les Weavers. En règle général, en cas de doute, prendre des colliers Weaver, qui se montent sur les 2 systèmes.
http://fr.wikipedia.org/wiki/Syst%C3%A8me_de_fixation_par_rail

par jacquemet Jeu 24 Mar 2011 - 20:39

Retrouvé sur le site Brownells ici : http://www.brownells.com/.aspx/lid=10724/guntechdetail/Picatinny_Rails__Weaver_Rails__What_s_The_Difference_

Picatinny Rails, Weaver Rails, What’s The Difference?
When you are looking through the Brownells Catalog, there are many different parts and accessories that use the words Picatinny and Weaver to describe what they are compatible with. Just what is a Picatinny Rail anyway? And how is it different from a Weaver? It will be beneficial to look at the origin of the Picatinny system first.

The “Picatinny Rail” is a term that has evolved in the firearm industry from a military standard, specifically MIL-STD-1913 (AR) which was adopted on February 3, 1995. The title of the publication is “Dimensioning Of Accessory Mounting Rail For Small Arms Weapons” and this document specified exactly what the dimensions and tolerances were for any mounting systems that were to be submitted for acceptance by the military. The term “Picatinny” comes from the place of origin for this system, the Picatinny Arsenal located in New Jersey. MIL-STD-1913 specifies the dimensions required for consideration, including length, width, height, and angles and the tolerances allowed for each measurement. The key distinction of the MIL-STD-1913 lies in the specification for the profile and the recoil groove.

Source: MIL-STD-1913 (AR) 3 February 1995

Source: MIL-STD-1913 (AR) 3 February 1995

What are the differences between the “Picatinny” and the “Weaver” systems? The profile of the two systems is virtually identical. Depending on the quality of the machining done by the manufacturer, the two systems should be indistinguishable from the profile. The key difference lies in the placement of the recoil grooves and with width of the grooves. MIL-STD-1913 (Picatinny) grooves are .206” wide and have a center-to-center width of .394”. The placement of these grooves has to be consistent in order for it to be a true “Picatinny” MIL-STD system. Weaver systems have a .180” width of recoil groove and are not necessarily consistent in a center-to-center measurement from one groove to the next. In many instances, a Weaver system has a specific application that it is machined for, so interchangeability is not necessarily an issue. A MIL-STD-1913 system must adhere to the specifications listed above in order for it to be considered MIL-STD, since the military desires uniformity in the recoil grooves to allow for different systems to be mounted on the weapon with no concern for compatibility.

Now, what does this mean to you? Boiled down, it means that accessories designed for a Weaver system will, in most cases, fit on a “Picatinny” system. The reverse, however, is probably not the case. Due to the larger recoil groove, “Picatinny” accessories will not fit a Weaver system. There are, of course, exceptions to every rule, but for a good rule-of-thumb, “Picatinny” won’t fit Weaver, but Weaver will fit “Picatinny”.

Sur le site Brownells, il y a aussi des schémas qui ne sont pas passé avec le copié collé.