Where to get parts to convert JM pro into duck gun?

[griffon]

My son needs to convert his JM pro into a duck gun for this fall.
The mag extension has to go so he needs a fore end cap and a shorter mag spring and a plug.
Where can he find these and are we forgetting anything?

 

[OhioArcher]

Get 'em through Mossberg. I ordered a set about two years ago but I don't remember the part numbers. I believe it was just a standard 930 mag cap and spring. Don't forget to put a plug in it to limit it to three rounds, chamber and mag combined.

 

[Tuflehundon]

Why does the magazine extension have to go? I used a Mossberg 500ATP 8 shot shotgun for hunting for a while. I just got a wooden dowel from Home Depot and cut it to a length for use as a plug. I was only allowed 5 in the gun in my state so I made it so the plug let me put 4 in the tube, and I would load one in the chamber. Had a few rangers ask if it was plugged, I'd say yes, and that was the end of the discussion.

 

[shaner]

That's what I was thinking. That's the way it is here in Ohio's long as your plug limits the rounds

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