Me and my father in law just went to the range Tue so I could zro my sport II and DD for the first time.
Luckily we put about 200 rds through each without a single bad round using gen II Pmags.
I was using Wolf 55gr on my sport II and 62gr on my Daniel Defense.
Hopefully you get your issue figured, I would have been hot if I had any problems from a brand new riffle the first time I fired it.
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M&P15 sport II, Retired Army
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