Weaver and Picatinny Rails

By CTD Blogger published on in Gear

So you have a new scope that you want to mount on your rifle. The scope came with a set of rings that are Weaver style. All you need now is a scope base and you will be set to mount the scope on your favorite firearm. When you start looking for scope bases you will find two styles that look the same in the pictures, but are not the same. One is called Weaver and the other Picatinny (MIL-STD-1913). These two rails, in many cases, can be used interchangeably.

The main differences between the Weaver and the Picatinny rails are the size of the cross slots and the slot spacing. Weaver rails have a slot width of 0.180″ (4.572 mm), but are not necessarily consistent in the spacing of slot centers. The Picatinny rail has a slot width of 0.206″ (5.232 mm) and the spacing of slot centers is always 0.394″ (10.008 mm). Because of this, Weaver devices will fit on Picatinny rails, but Picatinny devices will not always fit on Weaver rails.

So those Weaver style rings that came with your new scope will work on both styles of rails. If the scope has been supplied with Picatinny style rings, you will most likely be limited to only the Picatinny mount. Picatinny mounts and rings will most commonly be found on products that were originally designed for military use and have found their way into the civilian market. For instance, the top rail on an AR-15 (the civilian version of the U.S. M16 battle rifle) flattop receiver is a Picatinny rail. You are able to use both styles of rings on this rifle.

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Comments (4)

  • Haoleus


    How do these rails go on? I have a pumpaction shotgun, i think its a remington or winchester. Not a combat shotgun just a refular. But i want to put a reflex or a red dot site on it.

    Is this something i can order and it come with a kit that makes it mountable on any barrel or surface?


  • Michael


    I have a rem 700 varment with a weaver style mount and ring. I am having problems with the scope hitting me when I fire the rifle. I have made adjustments to the eye relief setup with no discernible difference. I am thinking if I change to a pica tinny rail, I may be able to correct this issue. Any assistance with this problem would be greatly appreciated.
    Michael v


  • Scope on mp15 sport?


    [...] Weaver and Picatinny Rails | The Shooter's Log I have had little success mounting a scope on a rifle unless I used the scope manufactures mounts but that's just me. Here is a 3X9 Burris mounted on my Stag and it's rock solid. The red dot is also a Burris and so are the mounts. The red dots for sale and in the member WTS/WTB thread. P28091423.jpg click image to enlarge…. "Violence is seldom the answer but when it is the answer it is the only answer". "When the people fear the government, there is tyranny. When the government fears the people, there is liberty". Thomas Jefferson Reply With Quote   + Reply to Thread « Previous Thread | Next Thread » [...]


  • WoodyTX


    Thank you for explaining this. I knew there was some ability and limitations to interoperability between the two, but you put it quite well.


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