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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)
Honestly the hardest part is keeping the shell stop/interrupter rails from falling over while you're installing the shell adapter.
I take that back, getting the magazine off was the hardest part for me since my Maverick had red loctite. But after the heat gun it was smooth sailing!
Easy to install. Good price. I like that you can leave it installed while loaded.
I installed the mini-shell adapter in an old Montgomery Ward Western Field M550 (Mossberg 500) that I was rescuing, with the hopes I could keep it set up with a load my 90 lb wife could handle in a pinch. It was easy to install, and after cycling some dummy rounds through the shotgun, everything seems to be getting along perfectly!
Now I can mix Mini’s thru 3” at the same time. Install video made the conversion quick and easy.
This adapter is great in my shockwave.