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Hi Dan and welcome. Apparently, ACT 10rd 45ACP work no issue. The WC 9rd 10mm? should work as well. Good thread read here: https://www.sigtalk.com/threads/p220-10mm-2-base-pad.442003/ ---------- cheers and stay safe!

yes they will fit and work

No, a Wilson Combat 9-round magazine designed for a different pistol will not fit in a Sig Sauer P220 Legion 10mm; the magazines are not compatible due to different dimensions and design specifications specific to each firearm. Key points to remember: Different magazine standards: Different handgun models, even within the same caliber, often use different magazine designs that are not interchangeable. Check compatibility: Always verify if a magazine is specifically made for your pistol model before purchasing.