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Posted: 3/19/2014 4:52:44 PM EDT
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Ok picked up a nice used Steyr SSG69 and wanted to put a 30mm scope on it. Some may know that the rings for these are pricey. So I picked up a Picatinny rail from Steyr. I foolishly though it may be a quick detach type like the rings and was wrong! Without being too long winded I don't want to booger up the receiver on the rifle with the 4 set screws. So what do I put between the rail and the receiver? I was thinking about 4 pieces of #4 or 6 shot or some thin steel shim material. Obviously I cannot have the scope moving on me, I know it can't go forward as there is a stop built into the receiver. Thoughts?   |
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Quoted:
Those set screws have to dig into something to hold on, and I would think any barrier will degrade precision. Not necessarily. Since the mount has a recoil shoulder built in the screws aren't going to do much of anything other than press the mount upward, against the underside of the dovetail grooves in the receiver. I'd use a lead shot under each screw. That will actually hold tighter than hard steel screws against hard steel receiver. (At least against shear forces.) The exception would be if the screws were much harder than the receiver and they were torqued down enough to bite into it, but that's what he wants to avoid. To explain my theory in an example- I know a guy who moves houses for a living, he raises them off their foundations, blocks them up and transports them on steel I-beams and crossbeams. He uses very heavy Armstrong C-clamps to hold the beams together, (but never steel-to-steel.) He always places a piece of 1/2 -inch plywood between the beams before clamping the crap out them so they don't slide. I may be wrong, but I think the OP's situation has similar requirements, on a much different scale of course. The lead shot would act much as the plywood in my example. |
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Well I slipped the mount on with the aid of some oil and a mallet. Yes, the fit was so tight I had to use two plastic mallets stacked to beat it into position. When I though I had it in place I tightened the screws only to find that I still had farther to go. Looked at the top of the receiver and not scratch! Put rail back on tightened the four screws with blue loctite and mounted the scope. It isn't going anywhere! |
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