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)
Installed both the adapter and follower into my new Mossberg 500. The shortie shells don’t consistently work. If the last round in the magazine tube is a shortie, it flips and jams 99% of the time. Sometimes the shorties flip even if they aren’t the last round and I am not short stroking. Really wish it could be more reliable.
Hi Vinny sorry you are having trouble, we'll contact you by email so we can figure out what's going on.
This works well but makes the 7th and especially the 8th round very difficult to load in the mag chamber on Mossberg 590. It also makes taking shells out without cycling difficult. I wanted a set it and forget it solution but ended up taking it out as I don't shoot mini shells that often. I'll just drop in the opsol if needed at the range. Not sure if just defective or a known problem.
Sorry you weren't completely satisfied with your adapter, we do have a 100% satisfaction guarantee so you can always return it for a full refund if you prefer. Regarding those issues you mentioned:
We haven't had any complaints about shells being more difficult to load depending where they are in the stack. You do need to push the flap out of the way, but that's the same regardless which round you are loading.
Regarding shells being difficult to unload from the magazine, there is a simple technique to unload shells easily, check out this video: https://youtube.com/shorts/SQO47lKMd5E?si=bWzztJA31G33eKsy
In the end it sounds like you didn't care for the flap, perhaps our MiniPro solution would be more what you're looking for: https://defendertactical.com/products/mini-pro
Anyway, let us know if you need assistance with a return or an upgrade.
Have a Mossberg 590 that I couldn’t cycle mini 1-3/4” shells before I installed this adapter. Now it works perfectly.
-
This works fantastic in my maverick 88, feeds minis and 2 3/4 with 0 issues .