I do not know how much a replacement barrel and recoil spring costs, but I'll look into it. If you wanted to go from the 5.25 barrel length/slide length you would have to replace the entire upper/slide of the firearm. I would imagine that it's easier and cheaper to just go ahead and purchase the 3.8 barrel length handgun instead of buying a replacement slide assembly for it.
"It's a gun you loaded on Sunday, and shot all week."
"If God didn't create man equal then Sam Colt had made them equal."
"Fast is fine, but accuracy is everything."