I am looking to get back in to 3 gun after being out of it for over 7 years.   I am considering the Mossberg 930 series.  Mossberg  has a the 930 JM PRo and the 930  HP 12M/28MC 12 round     Other than the extended mag tube  I can't find any difference.  Anyone  have any experience between the two?

The JM Pro is finished slightly better. Things like the loading gate/elevator, charging handle, are all "upgrades." I'm not sure but I thought I remembered one of them couldn't take chokes, but that was a while ago, so don't take my word for it.

JM Pro upgrades-

•Chromed gas piston assembly, hammer, sear, and mag tube
•Nordic Comp mag tube extension
•Beveled loading gate and shorter forend
•Extended elevator
•Oversized charging handle and bolt release
•Trigger over-travel stop

The 930’s simply dont run.   I have witnessed too many not run to recommend one.

Go with an m2, weld the lifter and go from there.

The 930’s run with smooth hulls. They’re picky on ammo

Mine eats everything except the low tier Win garbage like super speed, super trap, etc.
Hulls are too sticky for a gas gun.

Get a pack of Wolff mag tube springs.