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Do you have a 512 or 517?
The catalog say either will mount on a Picatinny rail.
You could have a problem with your rail.
I'd suggest you:
1)check the rail for any burrs in the area where it mounts
2)move the sight forward of back 1 or 2 slots to see if there is a change in registration
3)try the sight on another weapon,, do you have a ruger 10/22 or anything with a rail?? If not a friends weapon.
My $00.0002
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Go raibh tú leathuair ar Neamh sula mbeadh a fhios ag an diabhal go bhfuil tú marbh
"May you be a half hour in heaven before the devil knows you’re dead"
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