Factory Springfield Armory XD Sub-Compact 9mm 16 Round Magazine With X-Tension. The Springfield Armory XD Sub-Compact magazine is the perfect replacement magazine for your sub-compact XD or XD Mod2 handgun. This magazine is capable of holding 16 rounds of 9mm Luger. It features a stainless steel magazine body with a grip X-tension sleeve that allows this full sized magazine fit with the grip from your sub-compact XD grip.