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Hi Altha and welcome. This 590S (the S stands for Short) takes 10 of the 1-3/4" shot shells. the other Shockwaves can take the same with the OpSol short shell 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 - Cheers and stay safe!

Altha, the 590S with 18.5 inch barrel is considered a shotgun, unlike the versions with 14" barrel, which are a completely different category of 'firearm'. The 'S' models will accept 1 3/4" mini shells without the use of an adapter. Since this has a 18.5" barrel, it also has a longer tube magazine and will hold more shells than the standard Shockwave with 14" barrel. Other than those things, they are all basically the same. Stay safe & have a great day!