I have a Tisas 1911 tank commander 9mm brand new and this guy offered me a Girsan MCP35 PI 9mm 50 rounds through it as trade for my Tisas.
Is this a good trade?
Ask yourself, why did J.M. Browning design the 1911 for 45ACP? Was it HIS idea? Nope, the 45ACP round came into existence in 1905 as a fully developed round! Browning favored a smaller bore round along the lines of the 38 Super or a then not developed 40 caliber, but the ARMY specified any new service pistol must chamber the 45ACP.
This is why Luger built a series of 45ACP chambered guns for testing, even though the 9mm was then in-service in Germany.
When Browning pulled up stakes and went to Europe he began work on his seminal design that eventually became the Hi Power, a 9mm, 13+1 shot pistol that to this very day has never really be eclipsed in terms of form and function. Pick up a Hi Power and note it has a lower bore axis than even Glock! The Hi Power is slender, sleeker than the 1911, with the weight biased in the hand rather than muzzle. Even with a steel frame, the Hi Power is not a heavy pistol. The Hi Power of today can hold 16+1 which is over double the shots of the mighty 1911 in 45ACP. When each bullet can kill, can wound, the logic of having twice as many makes a lot of sense versus the notion of putting someone down with a single, massive round - which the 350fpe 45ACP is NOT any more than the 330fpe 9mm round!
The reason the 9mm has become preeminent is because a hit to the chest cavity with a single round has the same statistical probability of incapacitation as the 45ACP! I know that hurts to read, or hear, but them's the facts, and everybody would rather have 17 shots over 8 everyday including Sunday and federal and state holidays.
With all that said, and admitting I own pretty much one of everything and 2-5 of most, I'd take the Girsan trade over the Tisas. I don't think you'll come out thinking you lost something. In general, 1911 chambered handguns today are much less expensive than the much more recently introduced Hi Power clones. Either is a fine choice, but come on, if you decide you NEED a handgun for defense, are you REALLY gonna grab your trusty 8-shooter? Or your 17 shooter?
And for the record, though OEM 45ACP has an edge over 9mm, statistically that means nothing. the 45ACP simply isn't THAT much more potent than the 9mm to make a "yuge" difference.