jlauer, you totally right, Cooper had problems with the 17M4 chamber. Doug and several others I know had guns that wouldn't shoot but Cooper did fix them. I refused to send my back and forth like Doug did. I had Eddie rechamber it to the 17 Jav Imp for a fire form barrel. Ended up giving it to GW , barrel shoots quite well as the 17 JI. Cooper had a crappy reamer for the 17M4, at least at the time frame I bought mine(2004).
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