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Hi Rolf and welcome. This adds +1 2 3/4-inch shell. +2 or better extensions available here: https://wilsoncombat.com/accessories/parts-for-shotguns/shotgun-magazine-tube-parts.html -------- Cheers and stay safe!

Good evening to you!! This adds one extra 2.75" shell. Plus 2 extension is listed below. Have a good rest of your day. https://www.opticsplanet.com/lyman-remington-870-2-rounds-shotgun-magazine-extension.html