I've seen on here that people have been buying 9mm barrel conversion kits for their xd40 and wanted to get some feedback. I think this is mod is cool in theory but was wondering how reliable it is to take a 40 cal xd model and convert it to a 9mm simply by swapping out the barrels. Any failure to load or cycle being that the springs would be a little tighter on the 40 cal models? Any feedback would be appreciated. Also, who is the best manufacture to buy the 9mm barrel from?