Hello i just purchased my first 1911, also my first pistol, and have questions about modifications. Due to a blunder with the seller, I bought a Mid size or Commander's length version instead of a full size version. I recieved it at my FFL and was like "Not want i want but I really dont want the hassle of complaining" and it felt great in my hand. Now it took me awhile to save up to get this so im going to mod the crap out of it till it's perfect. Due to this mistake my budget is slashed. My problem is that on the Rock Island Armory mid size they don't have a barrel bushing and have a bull barrel which is incompatible with most drop in compensators. So now either i try to find a special threaded compensator and try to have my barrel threaded, or go ahead and get a 5 inch slide and barrel and just put that on. How difficult is that? What would i have to do in either case? Is it just a simple matter of changing the slide, well i mean theres the spring inside but you know what i mean. P.S. Tried to partially dissasemmble the pistol the other night, pulled the pin and the slide release but when i tried to move the slide forward to take it off it went only so far before locking up, looked up video after video dont know what im doing wrong.