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** FOR 590S ONLY **Theattachment mechanism on the factory 590S cartridge arrestor isnot very robust, so we modified our patent-pending Universal Minishell Adapter to fix this problem, and we are now offering it in an upgrade kit for the 590S.
This kit is compatible with any Mossberg 12-Gauge 590S pump-action firearm with machined grooves in the receiver. Please refer to the picture or the installation video below to confirm yourfirearm\'s compatibility, but we\'ve never seen a Mossberg pump-action firearm without these grooves.The arrestor is constructed from vulcanized thermoplastic rubber, and the follower is machined from solid 6061-T6 billet aluminum.
*The Cartridge Arrestor and Magazine Follower are optimized to function as a pair, but the factory and other aftermarket followers may function as well for those that do not wish to use the one provided.
Please note there may be a short break-in period for some arrestors 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.
