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Gonzalo, this one comes in 45ACP : https://www.budsgunshop.com/catalog/product_info.php/products_id/96723/SIG+320F45B+320+45+STRK+10R+BLK
here is the p320 in 45acp https://www.budsgunshop.com/catalog/product_info.php/products_id/96723/SIG+320F45B+320+45+STRK+10R+BLK you can not convert to 22lr or 45acp with the X-caliber kits from sig web site "The P320 is one of the most modular pistols in production thanks to the serialized and removable fire control unit. The P320 can be converted to 9mm, .357 Sig, .380, and .40 S&W from any of these calibers. .22 LR and .45 ACP are the only caliber that the P320 cannot currently be converted to."
