Question: what is the difference between a weaver base and picatinny rail?
Answer: because the Picatinny locking slot width is 0.206 in (5.232 mm) vs the . ... Another difference is that Weaver rails are continuous with only two to four recoil grooves cut, while Picatinny rails have recoil grooves cut across the entire length of the rail at the above noted spacing (like a dotted line).