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Paul, Sig makes this gun in both single action only, and SA/DA. This is the single action only model, as confirmed by SAO at end of serial number. The SA/DA model is here https://www.budsgunshop.com/product_info.php/products_id/149014/sig+p220+legion+10mm+5+xray3 , Stay safe & have a great day!

Hi Paul and welcome to the community. The manufacturers model number is the key to identification. This model is SAO (Single Action Only). The SA/DA model number is here : https://www.budsgunshop.com/product_info.php/products_id/149014/sig+p220+legion+10mm+5+xray3 - Cheers and stay safe!

Paul, as mentioned this model is single action only. If interested here's a link to the double/single action model. Hope this helps, link here......................... https://www.budsgunshop.com/product_info.php/products_id/149014/sig+p220+legion+10mm+5+xray3

As mentioned below, this model Sig is indeed a (SAO) Single Action Only.