I had to shim it to snug up to the marvel (weaver) base. Manual says Picatinny/weaver. Oh well. I'll try it tonight.

Richj,

I have one on a .470 NE double rifle and it is living fine.

If it survives on the slide of a 1911 ... it'll live anywhere! Let us know!

Good luck,

That's a .22 conversion with a fixed rib. replaced the grips and screws. Using 22 fed hi-vel bulk pack ammo.