Well, IMHO, the $325 is a good price but no bargain unless it's NIB. Why not keep looking for a convertable BH and get it right from the factory. You'll save the cost of fitment, and either come out with two guns or trade/sell the 7 1/2" bbl one and get your money back. Might even make a couple bucks profit. I guarentee you can get a good NIB 45c/45acp for less than the $450 or more you'll end up spending by the time you get the spare fitted to his current gun. Gun $325 + 45acp cylinder $80 + Shipping $45 (average)= $450