now the problem is find that barrel,UNco doesn't have it any more.the silver version or the normal for the threaded barrel are the same,right?I saw the cqb standoff and looks very cool,does it need modification to fit a g17 or g19?Have you seen this? (http://www.brownells.com/aspx/NS/store/ProductDetail.aspx?p=20944&title=GRIP+ADAPTER+%26+MAG+WELL+for+GLOCK%7e)