The Colt 1991a1 has enjoyed a giid reputation since its introduction. I dont know of any time frame that should be watched for as being less than acceptable. Basically Colt got back in the 1911 business with its introduction of the 1991a1 and as far as I'm concerned they are still in it and doing it right.
I dont think you have anything to worry about with a Colt 1991a1 mfg'd in 1997.
I dont think you have anything to worry about with a Colt 1991a1 mfg'd in 1997.