Cooey 600 firing problems
Had the same problem with mine after many thousands of rounds. I took out the bolt and checked inside the receiver with my finger. Lo and behold, not only was the inside crudded up to hell, but somehow there was a small rough spot in there. After cleaning out and smoothing the bump it shoots good as new again. These rifles have to have a free slide on the back of the bolt, if anything slows it down it won't fire reliably. Try cleaning the receiver thoroughly and see what happens.
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