Joined
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92 Posts
Have done some research without much luck.
When I first received my Gen 2 MPX I quickly found my light 9mm loads (4gr RD, 115 Xtreme RN*@ 1.135 OAL) would not cycle or reliably feed with Gen 1 or 2 mags but it gobbled up any and all factory loads. *Second*set of loads I increased charge until the gun would properly cycle but quickly found I was having severe feeding issues. *Increased OAL to 1.160".
Current load of 5.5gr of Unique, 115gr Xtreme plated @ 1.160" runs like a top in my single Gen 2 mag. *Put the same load in my Gen 1 mags and it's constant FTF all over again. *The rounds all jam in the same manner (picture below). *
The only other exterior spec that differs from my loads to factory is the amount of crimp and I've got my back against a wall (.377) here since I like the economics of plated bullets. *All rounds pass the plunk test.
Any insight here? *Have a handful of Gen 1 mags I picked up at a decent price and would love to get these working.
TLDR:
Gen 2 MPX cycles reloads and factory ammo perfectly out of Gen 2 mags.
Gun eats factory ammo with Gen 1 mags but severe FTF with reloads. *Rounds at 1.160" and .377" crimp.
When I first received my Gen 2 MPX I quickly found my light 9mm loads (4gr RD, 115 Xtreme RN*@ 1.135 OAL) would not cycle or reliably feed with Gen 1 or 2 mags but it gobbled up any and all factory loads. *Second*set of loads I increased charge until the gun would properly cycle but quickly found I was having severe feeding issues. *Increased OAL to 1.160".
Current load of 5.5gr of Unique, 115gr Xtreme plated @ 1.160" runs like a top in my single Gen 2 mag. *Put the same load in my Gen 1 mags and it's constant FTF all over again. *The rounds all jam in the same manner (picture below). *
The only other exterior spec that differs from my loads to factory is the amount of crimp and I've got my back against a wall (.377) here since I like the economics of plated bullets. *All rounds pass the plunk test.
Any insight here? *Have a handful of Gen 1 mags I picked up at a decent price and would love to get these working.
TLDR:
Gen 2 MPX cycles reloads and factory ammo perfectly out of Gen 2 mags.
Gun eats factory ammo with Gen 1 mags but severe FTF with reloads. *Rounds at 1.160" and .377" crimp.
