Hey Chris, check out Fusion if you're wanting another custom 1911 built. Cogan does build nice stuff too, but I think you can get a lot more gun for less money from Fusion. Bob Serva is the man there, he has as much experience as anybody ... I currently have a Fusion 10mm with a longslide and 6" barrel, and am having a Commander Bobtail frame Stainless .45 built. I also have a customized Springfield TRP with all Ed Brown internals and action work by a great local smith, and a Kimber 5" that's been worked over as well. The Fusion is still my favorite shooter, and 10mm out of a 6" barrel just rocks!
Congrats on the RRA purchase! A RRA Tactical Entry was my first AR, and 10 later it's still one of my favorites. Great quality and reliability, and the 2-stage trigger is fantastic. I put the GG&G free-float rail on it and love it. 16" carbines are supposed to be light weight, so why put a 12" rail on it? What would you ever need to mount that far forward anyway? I assume you have the standard collapsable stock, if so that $25 or so CAA cheek piece is one of the best mods you can do ... gives a great cheek weld and mounts solid. I get to run mine on full-auto occasionally as well, since I have a buddy with a couple registered full-auto lowers ... because of that I put a PRI QCB brake on it, and it really keeps it under control for a full mag. Also put a YHM flip gas-block front sight on, Bobro short front grip, and a Pentagon light. And of course some Duracoat work. I can post a pic if you'd like.