Add to Cart Compare Quick view Sig Sauer P320 9/40/357 Lower Parts Kit $219.00 This complete lower parts kit includes all the upgraded pieces from Sigs' voluntary drop-safe recall. This kit is completely compatible with any upgraded Sig P320 slide in 9/40/357. This kit will not work with the .45 ACP Sig P320 or a .45... $219.00 Add to Cart Compare Quick view