Originally Posted by Ranger-6
Maybe their tech-writer program is a low budget operation.
But what bother me is not being able to find Weaver specification drawings.
I seem to only find Picatinny specification drawings.
What's up with that?
I remember reading that Weaver rails don't really have a specification like Pic rails. Pic rails have an actual military specification document filed.
Here's what Brownell's has to say...
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 wont fit Weaver, but Weaver will fit Picatinny.