Abe76 Posted July 5, 2021 Share Posted July 5, 2021 Hi all. First post    I'm having a problem with my Proarms Par mk3 5.56/223. The piston gets stuck on the barrel nut when cycling. I've tried a new piston and piston spring, no difference. I checked the clearing of the barrel nut without the spring, and that seems to clear the barrel nut just fine. The spring moves freely in the gas tube as well. The piston runs freely in the receiver. What can be off? Tried a new piston and spring, but no difference.  Another question. My extractor seems to be far back on the bolt. It's not flush with the bolt head. Replaced the extractor with a different brand, but same position. Could that be the extraction problem?  When the rifle was new it worked fine.   Some help would be much appreciated.  Thanks! Link to comment Share on other sites More sharing options...
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