Mossberg 930 JM 22" Questions?

Sudbury shooter

Sudbury shooter

CGN Regular
Rating - 99.2%
127   1   0
Hey guys, I just bought a mossberg 930 JM in 22" and awaiting for it to come in the mail. If anyone here has one maybe they can help me.

The tube holds 9 rounds of 3" but is limited to 5. How is this limited, I want to change how the tube is limited to hold 5.9 rounds of 3" so I can get 6 2 3/4" shells.

It comes with 3 chokes. What are each best for?Imp, Mod, Full

Update:

I removed the magazine tube and found a wooden dowel, I am going to trim it down so that it only holds 5.9 rounds of 3". It will give me a total of (6) 2 3/4" in the tube + 1 in the chamber and 1 ghost loaded.
 
Last edited:
5.9rnds of 3" shells as the firearm was made for, isn't 6rnds, if that happens to fit 6rnds of 2 3/4" and still functions, perfectly legal. Just like being able to use 50Beowulf mags in a 223 semi-auto rifle. Nothing wrong in that. I believe in earlier threads, the IRG JM Pros are plugged with a wooden dowel.
 
Trinimon said:
5.9rnds of 3" shells as the firearm was designed for isn't 6rnds, if that happens to fit 6rnds of 2 3/4", perfectly legal. Nothing wrong in that. I believe in earlier threads, the IRG JM Pros are plugged with a wooden dowel.
Click to expand...

It is one of the IRG ones, hopefully I can take it out and trim it to the proper length. Il let everyone know how it works. Also I found the ghost load video on youtube.
 
On the Mossberg 930JM;

You should replace the wood dowel with a skinnier piece of wood that doesn't compress the spring.
Carefully glue it into the end-cap, and don't get any glue on the threads.

You should also replace the follower with a S&J Hardware follower.
The sharp corners on the metal factory follower tend to get caught where the extension joins the tube.

Full choke will do the best job of knocking down steel plates.
 
Dexter Morgan said:
On the Mossberg 930JM;

You should replace the wood dowel with a skinnier piece of wood that doesn't compress the spring.
Carefully glue it into the end-cap, and don't get any glue on the threads.

You should also replace the follower with a S&J Hardware follower.
The sharp corners on the metal factory follower tend to get caught where the extension joins the tube.

Full choke will do the best job of knocking down steel plates.
Click to expand...

Thanks Dexter!

What do you reccomend for a rear sight? Mine only came with a front finer optic sight.
 
Trinimon said:
Good stuff. I'm on the fence with the JM Pro 930 and a Versamax Tac. Looking forward to your range review. :)
Click to expand...

If you get the versamax don't get the tactical. it is only marked for 3 " shells. if you get the hunting model it is marked for 3.5 inch shells. This means you can get more 2.75 inch shells in it. this is an advantage for three gun and shotgun matches.
 
mg4201 said:
If you get the versamax don't get the tactical. it is only marked for 3 " shells. if you get the hunting model it is marked for 3.5 inch shells. This means you can get more 2.75 inch shells in it. this is an advantage for three gun and shotgun matches.
Click to expand...

Good to know!! I thought they were all 3.5". Stupid Remington website doesn't say what size shells.
 
According to Casey at Tactical Ordnance, the VMT does in fact have a 3.5" chamber, it's just not marked as such due to feeding issues with 3.5" rounds in the extended magazine.
 
I have both the Versamax Tactical and the JM Pro. I won't repeat the information already stated here as it seems correct from my experience in particular the 3" vs 3.5" marked on the barrel of the VMT. Casey told me the same thing. If I had done my research properly I would not have chosen the VMT. Casey made a competition Versamax for a friend of mine that is better than the stock VMT.

I like the loading of the JM Pro off the bat. I don't like that the Versamax has a cartridge release which is an extra step in the loading process. JM Pro just has a bolt release. I suppose you can train yourself through that.

The carrier for the VMT is a killer. It is forked and will definitely take a bite out of your hand in fast reloading. I'm trying to find the time to get someone to do this in Vancouver toute suite. Also to be nicer the loading port should be beveled.

The Versamax is built tighter and slightly lighter. It is built better. I like the VMT's foreend better / the JM Pro's foreend is cheapish. I had a very poor experience with the JM Pro with cycling issues, shell stop problems. I should have sent it back immediately and after a seemingly endless back and forth just took it back and sent it to Tacord who sorted it out by replacing the spring and rebuilding it. It now seems to run pretty good though. I learned I should leave gunsmithing to others and send back lemons.

On the plus side they both shoot quite well now. Buckshot, target loads, slugs. I think they are pretty close in terms of recoil. I like both sights.
 
Casey sells the non-forked VM competition lifters for $90, IIRC. A very large improvent.

I opened up my VM's loading port myself with a Dremel and it's pretty easy. It took longer to disassemble and reassemble the shotgun than it did to do the work.
 
If I don't get the welding done this week I will probably avail myself of the lifter, thanks. With the dremel I have I could also do that myself I suppose.. what attachment did you use? I may 'practice' on my JM Pro first, though lol
 
I used a sanding drum on my Dremel. I went through 3 or 4 of them before I was done.

attach-sander-2.jpg


You may get better results if you have a die grinder or similar as I think a larger diameter sanding drum will do the work faster and more evenly than the smaller one on the Dremel.

I used masking tape to mark out the boundaries of the material I wanted to remove and went fairly slow until I got a feel for it.
 
Oh I live a 5 minute walk from both Cambodian Tire and Home Depot so I'm sure I can get replacements. Just will have to practice on something first so I don't screw it up.
 
You must log in or register to reply here.
Back
Top Bottom