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  #1  
Old 06-24-2016, 1:49 PM
MarikinaMan MarikinaMan is online now
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Default New 930 JM Pro (video of break in, stock shortening and lifter mod added)

Got my JM Pro two days ago.

Stripped it and cleaned out some gunk inside.

The bore pads kept coming out brown. Cleaned that out. The gas piston was sticky. Polished up the piston chamber, cleaned out the piston and rings. The tube for the gas system was dry and had carbon. Cleaned it out and very lightly oiled the tube and gas rings. Checked the bolt, no issues. Wiped it down and lubed the recoil arm pin.

Refitted the recoil pad to correct some bulge.

30 minutes later, she feels good.

I did a fitting. Drop and cast is good. I need to shorten the lop 1-1.25 inches. That's a little more involved. Will wait until I've fired her before going into surgery.

Also considering venting the spacer tube like the Or3gun marine tube. That's looks like 30 minutes on my drill press. Just need to consider repurcussions.

Test firing tomorrow. Maybe run 100 to 150 rounds through her. Can't wait.
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Last edited by MarikinaMan; 08-06-2016 at 12:34 PM..
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  #2  
Old 06-24-2016, 2:20 PM
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Take your time and be careful on the stock shortening job.

I shortened mine, 1" was the most I could remove, even with cutting the spacer in half. Used a Hogue grind-to-fit recoil pad to replace the OEM which didn't fit after shortening.

It came out alright, but not perfect.

I've been looking for another take-off 930 stock so I can give it another go, and I can't find any. I called Mossberg and they said that they are not selling that part to the public right now.
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Old 06-24-2016, 3:23 PM
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Quote:
Originally Posted by jimmykan View Post
Take your time and be careful on the stock shortening job.

I shortened mine, 1" was the most I could remove, even with cutting the spacer in half. Used a Hogue grind-to-fit recoil pad to replace the OEM which didn't fit after shortening.

It came out alright, but not perfect.

I've been looking for another take-off 930 stock so I can give it another go, and I can't find any. I called Mossberg and they said that they are not selling that part to the public right now.
Thanks for the advise. I may have a smith do the job to avoid mucking it up. Have you considered the Urbino stock?
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Old 06-25-2016, 12:34 PM
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Not really a break in, but more so, testing while I can still return it if the gun is flawed. 200 target loads and about 20 slugs. Zero issues. Flawless.



Sending it to the gunsmith for stock reduction.
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  #5  
Old 06-25-2016, 12:55 PM
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Nice! Since I am planning on getting, it's nice to know a simple clean up is all that is needed to get it to run perfect.

The Urbino stock looks great, but pricey. I was looking at getting a Choate pistol grip stock for mine, as they only run about $70. Any pistol grip stock will help LOP issues. I personally just prefer a pistol grip.
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Old 06-25-2016, 1:14 PM
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Quote:
Originally Posted by LowThudd View Post
Nice! Since I am planning on getting, it's nice to know a simple clean up is all that is needed to get it to run perfect.

The Urbino stock looks great, but pricey. I was looking at getting a Choate pistol grip stock for mine, as they only run about $70. Any pistol grip stock will help LOP issues. I personally just prefer a pistol grip.
Because of the safety location, I'm not even considering a pistol grip. Its a tough decision for me to send the stock out to be cut. Itll cost me 175. The Urbino is already 12.5" lop, is only 150. But I do want the standard stock.
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Old 06-25-2016, 1:21 PM
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I have one major issue. The 24" 930 is only taking in 9 shells in the tube. I wonder if I did something wrong in the assembly? The last shell is short 1/4" to fit. I'm thinking I won't tighten the magazine tube parts all the way to get me some more clearance.
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Old 06-25-2016, 1:32 PM
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Nope, that would be correct. It is a 9+1. 20" and 22" are both 8+1. Think about it. You can't get 5 1/2" of shells in 4" of extra mag. Cabellas also lists the mag cap as 9. http://www.cabelas.com/product/MOSSB...UN/1785183.uts

Edit: I believe it can holt 9 3" shells though, which is why the longer 24" tube is good.

Last edited by LowThudd; 06-25-2016 at 1:34 PM..
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  #9  
Old 06-25-2016, 1:32 PM
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You can get a longer mag tube for it. I believe it is the same one that the 590 uses.
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Old 06-25-2016, 1:34 PM
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Quote:
Originally Posted by LowThudd View Post
Nope, that would be correct. It is a 9+1. 20" and 22" are both 8+1. Think about it. You can't get 5 1/2" of shells in 4" of extra mag. Cabellas also lists the mag cap as 9. http://www.cabelas.com/product/MOSSB...UN/1785183.uts
Really, I mistook it for 10+1 with 2 3/4" shells. I thought it was 9+1 with 3 inchers.
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Old 06-25-2016, 1:39 PM
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Quote:
Originally Posted by MarikinaMan View Post
Really, I mistook it for 10+1 with 2 3/4" shells. I thought it was 9+1 with 3 inchers.
But, the plus side is it should also hold 9 3" shells, I believe.
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  #12  
Old 06-25-2016, 2:09 PM
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Outdoorlife review says 10+1 on 2 3/4 shells

http://www.outdoorlife.com/blogs/gun...-shotgun-3-gun

Ill call MB and ask them directly.

Edit: checked the manual. Its 9+1 on 2 3/4 shells.
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  #13  
Old 06-25-2016, 4:42 PM
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Cleaning the 930? It's JM bull****! Not having fun.
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  #14  
Old 06-25-2016, 9:09 PM
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200 shot shells worth of dirt.



Carbon!



There was some of this solder like metal splatter on my mag tube.



The rings were kinda burnt like a brake rotor. It too had some deposits.



It took some serious cleaning with a metal brush to smooth out the mag tube.
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Old 06-25-2016, 9:17 PM
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While at it, I took a gauge to the recoil tube to try and find a new nut for a stock shortening mod.


****it. Coudnt find a 5/8-32 panel nut. I just cut the OG nut.


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Old 06-25-2016, 9:23 PM
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Then I cut the recoil tube.



And the stock.

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Old 06-25-2016, 9:25 PM
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Got a total of an inch off.

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Old 06-25-2016, 9:30 PM
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I got it just right.



LOP was 14 inches. It is now 12.25 inches without a recoil pad. I just ordered a Limbsaver slip on recoil pad that is .5 inches thick. I'll have it at 12.75 or I could buy a 1 inch pad for further adjustment.

I plan to purchase a belt sander later this year. I'll put on a grind to fit recoil pad then.

The End.
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Old 06-25-2016, 9:34 PM
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BTW, before I started cutting, I did a fitting. Do not cut if you have no basis for what you are doing. I take no responsbility for inspiring more bubbadom.
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Old 06-25-2016, 9:39 PM
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One last thing. Taking 1 inch off allows the reuse of the original recoil pad if one were inclined to route off some plastic at the attachment point. The og arrangement was that the screw hole were recessed. After cutting, they are now flush. The pad wont insert fully without removal of more material.

Im lazy, I bought a slip on pad.
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Old 06-26-2016, 2:54 AM
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That's the same idea that can be applied to a Benelli Super 90 except instead of using a slip on pad you can cut a piece of aluminum sheet cut to fit inside diameter of the stock, use the stock rod and nut to secure it inside of the stock. Then you can rivet nut plates onto the aluminium sheet that match your mounting screws of your new grind to fit recoil pad.

Last edited by Munny$hot; 06-26-2016 at 2:56 AM..
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Old 06-26-2016, 5:12 AM
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Quote:
Originally Posted by Munny$hot View Post
That's the same idea that can be applied to a Benelli Super 90 except instead of using a slip on pad you can cut a piece of aluminum sheet cut to fit inside diameter of the stock, use the stock rod and nut to secure it inside of the stock. Then you can rivet nut plates onto the aluminium sheet that match your mounting screws of your new grind to fit recoil pad.
Thanks. I'll get to the grind to fit pad. I just dont have a belt sander on me to do the job right. The slip on pad will suffice, until I'm motivated to go further.
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Old 06-26-2016, 10:15 AM
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Observations after break-in.

The top of the bolt, part #36 put quite a bit of wear on the inside top of the receiver. I put in some grease on reassembly. If the load is not powerful enough, i can imagine the cycle hanging up due to the bolt galling the receiver. I'll be watching it, hopefully it not something destructive.



Part #24, the two horned railed gas spacer, has put wear marks on the barrel where it rubs cycling. I lightly oiled it. Since the gas system is so sensitive to spring strength and such, friction can probably cause issues as well. I'll be watching it in the future.



Thus it continues, my adventures with a 600 buck semi shoty.
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Old 06-26-2016, 11:19 AM
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Have you shot it since the recoil tube cut down? I know the 930 is real sensitive to changes.
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Old 06-26-2016, 11:45 AM
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Originally Posted by Don the savage View Post
Have you shot it since the recoil tube cut down? I know the 930 is real sensitive to changes.
I have not. The recoil tube reduction addressed the excess tube after the retaining nut was thinned down. I did not alter the recoil assembly except for surplus tubing. The spring and its chamber are still to spec.

Note: gonna switch from CLP to a high temp dry lube. Some users have reported an easier time cleaning.
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Old 06-26-2016, 4:31 PM
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Quote:
Originally Posted by MarikinaMan View Post
Cleaning the 930? It's JM bull****! Not having fun.
Buy a big jar of Slip 2000 Carbon Killer and cleaning the carbon off/out of your JM Pro will become quite a bit easier. I use a pint glass canning jar to put smaller parts in to soak and wipe the magazine tube etc. with a small piece of rag saturated with the stuff. Good Stuff!
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Old 06-27-2016, 4:32 PM
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Thanks for the tips.

I'm done with the JM Pro for now. Purchased more ammo and will be practicing with my new favorite gun over the next few weeks.

From 14" down to 13" LoP all for 1 hour of work and a twenny dollar Limbsaver. My budget shoty is still on budget

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Old 06-27-2016, 5:15 PM
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for the gas tube carbon deposits, these work GREAT

Birchwood Casey Lead Remover & Polishing Cloth

Restores original luster on most surfaces
Removes carbon fouling, rust, leading and more
Can be cut to size for cleaning gun barrels and chambers



http://www.cabelas.com/product/Birch...g&gclsrc=aw.ds
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Old 06-27-2016, 5:19 PM
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Nice! I have one and didn't think to use it.



I bubba'd the recoil pad to still take a swivel and fabricated a butt plate to distribute the recoil load onto the limbsaver.



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Old 06-27-2016, 5:31 PM
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13" on the dot without counting the limbsaver's give. I am satisfied with the fit. It will take time to develop my true form but it is an almost straight line to the bead with a very slight upward bias.

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Old 06-27-2016, 5:36 PM
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are you going to weld up the lift gate or leave it stock?
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Old 06-27-2016, 5:38 PM
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I have not figured out what that involves. Do you have a link?

I also have been practicing a lot with snap caps and I have been doing quad loads without hanging up my thumb.

EDIT:

I just realized what it involves. Easy peasy. I'll weld it later though. I see no need to do it right now.

Thanks!
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Old 07-19-2016, 8:41 PM
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Ive run quite a few shells through my 930. Well over 500 at this point.

Things I've learned.
1) Cleaning the gun is a beotch. Birchwood Casey Lead Remover cloth helps makes cleaning easier.
2) Federal Top Gun shells r dirty as chit.
3) Estate shells burn much cleaner and the gun is cleaner with CLP lubricant.
4) The gun will have FTE issues with shells loaded with less than 3 drams and under 1200 fps. Particularly Estate 2 3/4 dram 1145 fps target shells, I get 3% FTE or so. Keeping within these ranges or above and I am still getting 100% reliability.
5) Between dry lubricant and CLP there doesnt seem to be much of a difference when cleaning after shooting.
6) Bronze brush mounted on a drill is the only way to get the plastic out of the barrel. Wetting with CLP after shooting helps with cleaning later in the day.

Loving the JM PRO. Will probably be looking at another shotgun soon. Something shorter but still semi auto.
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Old 08-06-2016, 11:46 AM
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I love lazy Saturday mornings. I finally got around to visiting Bob at Elco Fabrication in Venice. Had him do the lifter gate weld on my JM. Bobs an awesome guy and should be recognized as a Venice Beach treasure. http://m.yelp.com/biz/elco-welding-venice





And while Bob did the work, I dropped it off and picked it up in 1 hour I got to converting my craigslist ghetto stroller into a tacticool gun caddy.





It's gonna look like this after I get the gun mounts I just ordered. I also got an awesome 68 inch sun umbrella and stroller mount for protection on match days

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Old 08-07-2016, 10:38 PM
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I just DROSd a JM Pro.

I picked up a bulk pack of ammo at wally world however I didnt pay attention was the fps was.

Is the consensus the fps needs to be in the 1300+ range for the rifle to cycle properly?
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Old 08-08-2016, 5:54 AM
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1200 has been doing well for me.

Im up to 1000 shells, Ive had 1 failure to fire. Im been told to keep an eye on it.

If it becomes an issue, cleaning out the factory grease helps, or replacing with the 10/22 firing pin spring is said to be a mod upgrade.
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Old 08-08-2016, 7:18 PM
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1failure to fire out of 1000 is darn good, i guess it hard to train for that unless one puts a dummy round in the tube.
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Old 08-09-2016, 5:27 AM
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Quote:
Originally Posted by jeremyy View Post
1failure to fire out of 1000 is darn good, i guess it hard to train for that unless one puts a dummy round in the tube.
Ive gone through a bunch of 1145 fps shells from Estate too. That one, I will get a less than 5% failure to eject. I shot 100 on an afternoon and about 3 failed to eject. As the rifle broke in, it became less of a problem. I can shoot the same shells with no issue now, but I still wouldnt trust them to hunt or compete with my gun. Not an issue with 1200 fps shells of different brands. 3 DRAM equivalent cycles the JMPRO good.
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Old 08-09-2016, 8:45 PM
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Sweet, bought one of these as well, good to see other folks working on them. Mine hasn't been fired yet
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Old 08-09-2016, 9:22 PM
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Posts: 10,867
iTrader: 56 / 98%
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Love mine. Took it home, checked the barrel for blockages, then went out and shot the living **** out of her. Keep meaning to clean her, but I keep telling myself I'll wait until she gets her first jam.
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