Well for starters, what kind of gun is it? Make and model please. Pending on the gun it may be possible to replace the one piece rod and go with a GI style plug and guide. As an FYI, any add on rail is going to make holster selection next to impossible. Most stuff from Command Arms (Fobus/First Samco) is pretty much crap, I tried some of their stuff when I was first starting out and I'm not impressed.