I had the same thing happen in a P90 I bought used.. took me almost 6 months to notice though, since it is an indoor only gun and the amount of hopup was still perfect for CQB range. :P
Now, that said, I have an SRC AK and when I took it apart, I noticed it apparently doesn't use a nub at all. It has a metal concave nub built into the thing. I feel kind of dumb asking this, like a mechanic asking if your car wont start because it's out of gas, but.. Are you sure it doesnt have the nub built in like mine?
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