How many rounds does a 1911 hold? A single-stack 1911 holds 7 to 8 rounds in .45 ACP and 9 to 10 in 9mm, while a double-stack 1911 like the Fusion XP Pro runs Glock 17 magazines and holds 17. Bob Serva breaks down 1911 magazine sizes, single stack vs double stack, extended magazines, and how to pick the right magazine for your caliber and frame.
