Identifying scope bases by dimensions

M

Migs

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Friends:

Does anyone have the diagrams or dimensions of the common rifle bases? I ask this because I could easily measure my rifle and see if it is a Picatinny, Weaver or rimfire base. Identifying by name is not practical if the name is unknown.

Thanks amigos,

Migs
 
I found this in Brownells:

"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”."

The dimensional graphic is here:

http://en.wikipedia.org/wiki/Picatinny_rail
 
Weaver and Weaver style bases are for the most designed for sporting/hunting rifles and handguns, and are usually two piece bases that can be turned to increase or reduce the spacing of the grooves to fit the optic in question if needed. As the information from Brownell's states the Picatinny system is standardized. This is so that optics and other equipment designed to fit on the rifles of one NATO nation's military will fit on any other standard NATO rifle.

It's the same reason that all NATO countries use the same ammunition, simplification of the supply system.
 
I am really looking for all the other base dimensions such as the ones used in rimfire rifles and benchrest rifles. The european rails as well (like on the Anschutz) So far Picatinny and Weaver are the only ones I found. -Migs
 
Migs I hate to say it, but what you need are catalogs from all the people who make bases and rings, and even then you likely wouldn't have all the dimensions.
 
Yes, but since I have some of these rifles, I will measure them myself and post. I'm sure someone will have a need for this info someday.
 
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