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Hi William, these will not cycle in semi-auto shotguns. They will not cycle in most pump actions, except the Mossberg 590S series, which is made to cycle these shells. It will also cycle in the Mossberg 500/590 series with the OpSol Adapter https://www.budsgunshop.com/product_info.php/products_id/36595/opsol+texas+miniclip+mini-clip+for+mossberg+500+590+12+gauge+1+round+polymer+black+finish , Other than that, it is mostly for single shot or double barrel shotguns. Stay safe & have a great day!
They will not cycle in most guns at all with the exception of the Mossberg 590S designed for them, various Mossberg pump models with an adapter installed, or Kel-Tec KSG/KS7 off the top of my head. Semi-auto is very unlikely to work due insufficient recoil energy to cycle the bolt as well as the geometry problems of the feed system for semi-auto and pump action alike. In the guns that will work or can be made to work with them, they can substantially increase capacity though.