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I first would look at the magazines, your shooting grip, ammo and proper PMCS on the pistol. If all of those are good to go I would next look at the feed ramp and recoil spring assembly. I have an M&P .45 ACP midsized and it has been flawless. I hope this helps.
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Magazines - both factory new, but will disassemble to check for issues.
Shooting grip - have never had an issue before with any weapons...
ammo - see above for ammo used. I could see Magtech being sketchy, but have never had problems with AE or Federal HS before. Also, ammo type was not mixed in magazines.
PMCS - weapon was purchased new, field-stripped, and relubed with Slip 2000. Malfunctions began immediately with first magazine.
I was hoping to qual. with this one next month in order to carry on-duty, but will need to put a bunch more rounds through it (w/o malfunction) before I even think about carrying it.
Thanks!