Yup, but it's only one round more. Any 8 round 1911 magazine should work fine in it.
Never seen any 1911 mags that hold more than 8 rounds.
Ah Dosborn, never seen those before, Chip McCormick has his name on it. Must be a decent mag. But that extra length would make an already large pistol even more difficult to CCW. However if this is just for range use, looks like the OP is three rounds up.