I have a Glock 19 Gen 4 with three mags for sale. There is a double undercut on the frame. It has a drop in Zec tech Fulcrum trigger and a red pin kit installed. I have an IWB holster and an IWB mag holder to go along with it. The gun has had an easy life with no smiley just yet. Sell or trade, G17 or AR9, cash can be added either way if necessary.