Finally got it sorted out

[wvbearhunter]

Several years ago I bought a Mossberg 930 JM Pro. The thing simply would not run, eventually it returned to the mother ship who declared it "within specs".... apparently failures to eject, failures to feed, and stove pipe jams are "normal".

I gave up on it for several years and then came across OR3gun and their tuning kits. The kit cost about $185 with shipping and included an adjustible recoil spring plug, heat shield, mag spring follower and an extended bolt release.

Install was very simple and I used setting #2 on the recoil plug (it has 4 settings). It appears all problems are gone, I ran a huge assortment of bird shot, 00/000 buckshot and some rifled slugs. Everything worked perfectly, so much so that its now my home defense gun.....10 rounds of 12g will solve most issues.

The most accurate buckshot was the federal flight control and the most accurate slug was the Freedom Munitions Xtreme.

 

[FEENIX]

Several years ago I bought a Mossberg 930 JM Pro. The thing simply would not run, eventually it returned to the mother ship who declared it "within specs".... apparently failures to eject, failures to feed, and stove pipe jams are "normal".

I gave up on it for several years and then came across OR3gun and their tuning kits. The kit cost about $185 with shipping and included an adjustible recoil spring plug, heat shield, mag spring follower and an extended bolt release.

Install was very simple and I used setting #2 on the recoil plug (it has 4 settings). It appears all problems are gone, I ran a huge assortment of bird shot, 00/000 buckshot and some rifled slugs. Everything worked perfectly, so much so that its now my home defense gun.....10 rounds of 12g will solve most issues.

The most accurate buckshot was the federal flight control and the most accurate slug was the Freedom Munitions Xtreme.

Always good to know things have been resolved and that there are alternatives. Thanks for sharing.

Is it one of these, https://www.or3gun.com/OR3GUN/about_or3gun_combo.htm

 

[wvbearhunter]

Yes indeed

 

[Gue342]

Good call on the OR3gun kit.

Mossberg 930 JM Pro is notorious for being picky out of the box within specs is their classic cop out. That adjustable recoil spring plug especially on #2 plus the other bits often turns it into a completely different, reliable gun.

Plenty of guys have the exact same story ran like trash stock, then the tuning kit fixed it. Nice that it's now your go to HD gun with 10 rounds of 12ga.

Federal Flight Control for buck and Freedom Munitions Xtreme slugs are solid choices too. Enjoy the now trustworthy beast.