The weaver mounting rails have slots that are 180 wide and do not necessarily have a consistent spacing between the grooves.
Weaver vs picatinny scope rings.
Due to the larger recoil groove picatinny accessories will not fit a weaver system.
Let us go in more detail.
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The main thing to consider is that there is still a bit of play in a weaver slot and typically picatinny specific rings also have a bit of play in a picatinny slot.
With picatinny rings the notch part that goes into the slot is 5 millimetres wide and therefore fits perfectly with the 5 23 millimetre slot on the rail.
Picatinny accessories will not fit on a weaver rail but weaver accessories will fit on a picatinny rail.
Picatinny rails are continuous and the spacing is assumed constant along the length whereas weaver rails commonly found for scope mounts only have one slot per rail section and the spacing is not assumed critical.
Weaver accessories are thus designed to be flexible in terms of slot spacing with the most common example being scope rings which can be placed at many points along the scope s body to accommodate the unevenly spaced weaver slots.
The recoil stopper in weaver rings is 3 8 millimetres wide while the one in picatinny rings is around 5 millimetres wide.
However when installing a weaver accessory on a picatinny rail slot.
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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.
Since we recommend pushing both rings forward toward the muzzle the amount of play in the slot is a moot point.
The slots on a picatinny rail are wider and deeper than a weaver rail section 0 062 wider 0 022 deeper.
Weaver slots are also smaller than picatinny slots at 180 picatinny rail slots are 206 and for both of these reasons accessories intended for a weaver rail will fit a picatinny rail.
Picatinny slots are 206 wide with a center to center groove width of 394.