Product Description Warne MESIG54DE, Magazine Extension made of 6061-T6 Aluminum with Hardcoat Anodized FDE Finish for Sig P320, Magazines (Adds 5rds 9mm Luger) Warne MESIG54DE, Magazine Extension made of 6061-T6 Aluminum with Hardcoat Anodized FDE Finish for Sig P320, Magazines (Adds 5rds 9mm Luger) at Hinterland Outfitters $44.99 Buy Now Check Price on Amazon Check Price on eBay