Sounds like a weaver rail. Look similar, different spacing and slot dimensions. Weaver accessories fit picatinny, heavy duty picatinny don't fit weaver.
Sounds like a weaver rail. Look similar, different spacing and slot dimensions. Weaver accessories fit picatinny, heavy duty picatinny don't fit weaver.
You should be able to find rings that will fit. Many do, but usually commercial type rings (like Weaver) and not the heavy duty "mil-spec" marketed ones.