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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)
Have a Mossberg 590 that I couldn’t cycle mini 1-3/4” shells before I installed this adapter. Now it works perfectly.
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This works fantastic in my maverick 88, feeds minis and 2 3/4 with 0 issues .
Cycles perfectly, great product-Thanks
Install was quick and easy for both the adapter and follower, especially with the video tutorials. Had to loosen the magpul stock to get the trigger unit out and took some shoving to get the adapter into the grooves, felt like I was tearing away some plastic material from the adapter. I fired 20 rds of Federal Shorty Slugs, mixing in some 2 3/4 slugs in there. All fed reliably. Just a little more annoying to manually unload the tube by depressing the little retaining spring, especially if you forget to push down the adapter so full size shells unload over the adapter flap instead of under it but otherwise functions perfect so far.