I had this problem when I was breaking in a brand new Yankee Hill Upper. It did this the first ten rounds or so. I took it home and cleaned it really good (it wass cleaned prior to the first shoot) and took it back to the range a couple of weeks later. It functioned fine.
Not sure what happened, maybe just a rough breaking in period.
BTW, I used a cleaning rod to knock out the spent casing.
Not sure what happened, maybe just a rough breaking in period.
BTW, I used a cleaning rod to knock out the spent casing.


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