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My son picked up a Nova, and I put a couple of rounds through it at a pattern board. Unless I was pulling on the forearm without thinking about it, it was unlocking, and the bolt was almost to the rear after each shot and it didn't have to go back much further to eject the empty. Is that...

Does anybody know of a good adjustable, rear sight that will replace a Heinie without having to do any machining?? Thanks!!!