ghostntheshell
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Hey guys, how wide (in MM) is a standard picatinny 1913 supposed to be? I'm having trouble with a mount / optic.
pic1913 specs please!
- Thread starter ghostntheshell
- Start date
QUOTE ..
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”.
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”.
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ghostntheshell
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I have a bc tactical mount, that is picatinny 1913 spec and a vortex sparc that is supposed to mount to picatinny or weaver.
The optic does not tighten enough on the mount. It maxes out adjustment - and wiggles freely.
I'm looking to find the width of a standard picatinny rail in mm's, so I can try to determine if my mount is out of spec, or if the optic is out of spec.
The optic does not tighten enough on the mount. It maxes out adjustment - and wiggles freely.
I'm looking to find the width of a standard picatinny rail in mm's, so I can try to determine if my mount is out of spec, or if the optic is out of spec.
Sounds like the rail is a different size as my Sparc mounted on top of my Norinco M4 rail with no issues.
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ghostntheshell
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My rail measures 21.17mm
The conversion I did from that drawing provided was 21.2mm
*re-measured*
The conversion I did from that drawing provided was 21.2mm
*re-measured*
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ghostntheshell
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Ok. I mounted the sparc on a buddies AR and it mounts perfectly. Mounted it a 2nd AR and its rock solid...
I'm thinking it's my mount then..
I'm thinking it's my mount then..
Ar180shooter
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I've run in to similar issues whle mounting optics on several Ruger 10/22's. It is possible to use a thin strip of aluminum as a shim, which would likely be the fastest and easiest solution.
ghostntheshell
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Yeah, I don't really know what to say. The size difference seems minimal - but it doesn't fit! Don't know what else to say really!
