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Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: September/25/2012 at 11:53
obro View Drop Down
Optics GrassHopper
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What is the difference between weaver style and picatinny bases ? Is it width of the slot or is there more than that ?
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: September/25/2012 at 13:35
stickbow46 View Drop Down
Optics Master Extraordinaire
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Picatinny was designed for the military,it has an exact spacing made to their spec.There are alot of companies out there that sell picatinney rails that are capable of dealing with both style of rings.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: September/25/2012 at 14:25
coyote95 View Drop Down
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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”. 
obro, hope this helps. also can a Mod please move this to Rings and bases forum


Edited by coyote95 - September/25/2012 at 14:30
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: September/25/2012 at 14:47
obro View Drop Down
Optics GrassHopper
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Thanks Coyote . That was the info I needed. I have a Trijicon rmr with picatinny mount and it will not fit a base I have . It is a weaver style base. I need a new base.
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