My 9mm Commander has definite ammo preference. It won't cycle my preferred carry ammo (135gr+ Critical Duty) and so I don't really carry it. It does just fine with gold dot and HST.
But my preference for a defensive 1911 will always be a .45 ACP because I can't afford a Wilson Combat or the services of a gunsmith and there is more margin for error with a production grade 1911 in .45
That said, a CZ SAO would be pretty awesome and I doubt you'd have the trigger return spring breakage problem.
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