Letter 'G' on barrel
 

Just recieved my '1920 commercial' shooter. It is a 1916 DWM with a replaced 30 cal barrel. On the bottom of the barrel where the serial # should be is only the letter G. Any one have an idea as to the origin of this barrel?

My post was rather vague, here is a picture of the Luger http://www.auctionarms.com/search/di...temNum=2787437
note the shape of the barrel where it joins the reciever and the unusual front sight which has a notch cut in it for apparently a white insert. This is very hard to see in the picture. Obviously an aftermarket item, trying to find out who made it.