Nope, you won't find a Glock 40-9mm conversion barrel. Lone Wolf, KKM, Storm Lake etc make them. Also look into changing out the the extractor and ejector for full reliability. I recommend a minimum of changing out the ejector so brass that won't fly into your face.
Assumption is the mother of all ****ups.
Know what you know, Know what you don't know. -Paul Pedzolt
"Jack of all trades, master of none, though oftentimes better than master of one" -Mynshul