Are these Cooey sights common and affordable?

[glycerin]

Oatmeal: I have one of these sights and discovered I would have to cut the stock on my .22 Mk.lV to install(NOT). I don't think it would be be sturdy enough for a .303. There is only one attaching screw . See Skinnerton P. 211

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[Oatmeal Savage]

glycerin,

I have a BSA that has been drilled and tapped. I have been thinking of adding a receiver mounted sight. I thought I could maybe find a way to mount a RossMk.III sight. I found photos the Cooey sight and it started me too thunk'in.

Oatmeal: I have one of these sights and discovered I would have to cut the stock on my .22 Mk.lV to install(NOT). I don't think it would be be sturdy enough for a .303. There is only one attaching screw . See Skinnerton P. 211

[Cantom]

glycerin,

I have a BSA that has been drilled and tapped. I have been thinking of adding a receiver mounted sight. I thought I could maybe find a way to mount a RossMk.III sight. I found photos the Cooey sight and it started me too thunk'in.

They're really easy to mount, they're just held on by the ejector screw. As someone mentioned though, that was for .22 recoil, not .303. Might not work very long...