Main Photo Universal Cartridge Adapter/Mag Follower Kit for Mossberg Pump Shotguns
Universal Minishell Adapter/Mag Follower Kit for Mossberg Pump Shotguns
Universal Minishell Adapter/Mag Follower Kit for Mossberg Pump Shotguns
Main Photo Universal Cartridge Adapter/Mag Follower Kit for Mossberg Pump Shotguns
Universal Minishell Adapter/Mag Follower Kit for Mossberg Pump Shotguns
Universal Minishell Adapter/Mag Follower Kit for Mossberg Pump Shotguns

Universal Minishell Adapter/Mag Follower Kit for Mossberg Pump Shotguns

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  • $25.00
  • $30.00
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Read the "Truth About Guns" Gear Review here!

This kit essentially provides a conversion to 590S functionality, but in a more robust design.  It contains our patent-pending Universal Cartridge Adapter and low-drag no-snag Magazine Follower which allows smooth cycling of 1-3/4" Minishells up to 3" Magnum cartridges in the same magazine.  The adapter is constructed from vulcanized thermoplastic rubber, and the follower is machined from solid 6061-T6 billet aluminum.  This kit is compatible with any Mossberg 12-Gauge pump-action firearm with a 3" Chamber and machined grooves in the receiver.  Please refer to the picture below or the installation video below to confirm your firearm's compatibility.  

Please note there may be a short break-in period for some adapters after installation.  Cycle a few magazines of full-size shells if you initially experience issues with 1-3/4" shells, please reach out to us if problem persists.  

*The Cartridge Adapter and Magazine Follower are optimized to function as a pair, but the factory follower may function as well for those that do not wish to remove it.



 (PATENT PENDING U.S. PAT. OFF. 17693832) 

Customer Reviews

Based on 63 reviews
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94.3
J
John M
Great product

Worked great in Maverick 88 and 590!

C
Craig H.
All good

I initially had some issues with the install that were entirely my fault. Wes went above and beyond to make sure I was squared away. The adapter itself works as advertised, but I can't say enough about how awesome the people at Defender Tactical are. If anyone has issues removing the mag tube on an 88 do yourself a favor and get a strap wrench. These tubes are easy to deform and ruin.

G
Gerald Bellotte
Delayed Installation!🫤

I'm sure your product will perform flawlessly. Although, my Mossburg Maverick 88 Security 7+1 magazine tube had the red threadlocker used on it, trying to remove it with just my hands evidently bent it out-of-round so it's absolutely useless right now. I contacted Mossburg yesterday and ordered a new one but seems like ALL Mossburg parts are out of stock and has to be back ordered. Just read some forums and seems like a whole lot of other owners have the same problem and are also waiting.

To be continued...

Hi Gerald, sorry you're victim of the red loctite debacle on your MAV 88. You'll probably need to apply heat to the threads to get it loose. Mossberg don't want to sell parts. They only want to sell new guns so you probably will be waiting forever on those from Mossberg. But there are people who buy these guns new and then part them out and sell the parts on eBay, here's one listing for a mag tube, but there are several if you look:

https://www.ebay.com/itm/354442162126

A
ArtB
Mini Shell machine.

SUPER easy to follow the Defender Tactical videos for installation. I have yet to have a mini-shell malfunction after adding the adapter and mag follower. It's very nice not to remove a "plug" to get different size shells in the tube. Nice product!

J
Jim S.
mini shell adaptor works well!

Works as advertised. Two boxes of mini's cycled smoothly through my
Mossberg 500 12 ga., including mixed mini and larger shells.

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