Extending Mossberg 930 JM Pro to 16

[NicVerAZ]

What option exists on the market to add +6 to the existing magazine?

Also would there be a danger related to shot spreading too early and hitting the extension and, if yes, what remedy would exist or choke to avoid?

Thanks for your help

[outerlimits]

have +8 on mine for years...no danger of shot hitting the tube at all.  other than dirt and fouling of the outside of the tube, who cares?

[NicVerAZ]

What brand did you use?

Link?

 

Thanks

[wgj3]

Think OP is wanting to add on to the factory 9/10 round tube for a total of 16 or so...

I think it's safe to say the most folk use a Nordic extension. Do some searching for "Thai tubes" that were moderately popular a while back and you will find 20+ round tubes, etc. It's not that you can't do it, just that most don't anymore.

Not a safety concern as you phrase it. Pattern does not open that quickly.

 

[roxymajor]

Here is the Nordic ext at Shooter's Connection.. 

http://www.shootersconnectionstore.com/Nordic-MXT-Shotgun-Magazine-Extension-Kit-12ga-P4221.aspx

I shot a Benelli M1 with a 18.5" barrel and a 7 round extension (10 round tube total) for two years without any issues of shot hitting the 10 tube extension.   I have seen some REALLY long open class tubes welded together.    

I suggest using a 10 round total or 12 round total tube.  This will give you either a "Two-Load" (10 tube) or a "quad-load" (12 tube) off the start signal.   I have always preferred the 10 tube for safer maneuvering and "throwing" in the dump barrel.  I have seen some long tubes bounce out of the dump barrels with excited shooters. (One on the second stage of the KY State Wildcat 3gun Match... with initials TJH :) )

[NicVerAZ]

I am going to use it in Open, because I have decided that I wanted to make this fun and not challenging.

I already shoot production and am already doing the "reloading a lot" thing in USPSA. For 3Gun, I am switching to sticks and 16 shells in the tube

 

[wgj3]

5 minutes ago, NicVerAZ said:

I am going to use it in Open, because I have decided that I wanted to make this fun and not challenging.

I already shoot production and am already doing the "reloading a lot" thing in USPSA. For 3Gun, I am switching to sticks and 16 shells in the tube

 

You can still run it with a 12-13 round tube and use the speedloaders/sticks. Shorter makes it a little easier to get around a stage and helps keep it from falling out of dump barrels/buckets. For some insight, Jerry M is someone that I would consider pretty solid in Open/Unlimited 3Gun. He is still running a tube gun and speed loaders. Guessing his tube is around 10-13 rounds in length...