u/Grassnicad29-2

I posted last week about not being able to mount my optics mount on my beryl. I have now tried two other mounts, a buddy let me use his beryl mount and I bought an old weaver style one. None go on, I can only turn the lever like a quarter turn. Does the knob it mounts to look messed up? There is no way three different mounts all can’t mount right and cause this much finish wear.