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 patented 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.  Not compatible with 590R.

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 85 reviews
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94.7
W
William
The right combo for your Mossberg !

Install went smooth & action was amazing after install ! Defender Tactical videos are excellent! Cut tongue for 590 ,inserted and cycled 2-3 round through ! Was ready to go after that ! Fired maybe 30 rounds so far and smooth working ! Defender Tactical product is awesome ! Thank you & God Bless!

J
Juan Garcia
Perfect upgrade

Perfect upgrade to your mossberg to run mini shells. No issues installing or mixing shell sizes. You gotta rack harder than usually for the mini shells to avoid them flipping and jamming. Otherwise well worth the price.

T
Tim B
Mostly reliable but temper expectations

This adapter looks great installed and will allow you to cycle mini shells for the most part but I still find it isn't 100% reliable. Sometimes it will cycle tube after tube without problem but occasionally a shell will not seat properly and either not feed or flip vertical while trying to cycle.

Sorry you have occasional problems with your adapter. Usually, this can happen when you Short stroke the action, The lifter can start to raise before the shell fully exits the magazine tube and the arrestor has a chance stop it in a controlled way, and that disruption can cause the shell to flip in an unfavorable position. If you use good slide discipline and technique, then you shouldn't have any problems.

G
Greg M
Quality Upgrade

First of all the customer service was great. I ordered the wrong adapter and Wes was great about the exchange.

The adapter was pretty easy to install, seems secure and is feeding well so far. The follower is a simple drop in.

K
Keith DoubleU
Simply Awesome

Great quality. Fast shipping.

Go Mariners!

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