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Take it from me rdn, it is a dovetain fit in the foresight block and it WILL move. Done a zillion of them and you don't need to be particularly brutal. Remove the nose cap, support the foresight...

You're forgetting the curvature of the earth AdeE!

You're question is just too ambiguous to andswer........ What is pinned? The actual FORESIGHT or the foresight BLOCK? The foresight block is longitidinally keyed and pinned to the barrel whereas...