My first post and a question. My local dealer whom I consider fair and honest and a good guy offered to trade straight across his new Gen4 model 21SF for my like new Colt .45 cal 1991A1 series 80 with original box. My Colt is the earlier parkerized model with the large 1991A1 roll mark. Just talking dollars and cents now would this be a fair deal? I currently own a Glock mod. 22 and love it. Being a very old man now on a fixed income this would be the only way I could get the model 21.