If you meant "Micro" 1911 then yes, I carried a Springfield Armory Lightweight Micro Compact (3 inch) 1911 in .45 ACP for 17 years post retirement. I carried the Remington 185gr Golden Sabres because they proved to be 100% reliable and they were also the most accurate at the time of my testing (2006). I loved that little gun and if I was awake, that little 1911 was on my side. The little 1911 was one of the most natural pointing pistols I have ever handled. I liked the Micro enough that when Springfield discontinued my model in favor of the same gun with a stupid tactical rail, I bought a 2nd plain Micro when I found one on GB. With the Wilson Combat Officers Model 7rd magazine +1 in the chamber I had 8 rounds of .45 ACP on tap with the Micro.
The biggest issue with the Micro .45 ACP is to replace the recoil spring assembly fairly regularly (I do it at about the 1000rd mark) and they are only available thru Springfield Armory.
Only last July I replaced my EDC Micro with a S&W CSX 9mm after running the CSX thru its paces. The CSX is slightly smaller overall, the CSX is lighter, even fully loaded than my Micro .45 and with the very slightly extended 12 round magazine in place, I have 12+1 rounds of 124gr Federal HST immediately on tap. The CSX also points very naturally for me and it feels and shoots a lot like my 2nd favorite firearm of all time, a Browning Hi Power.