I know we have more than a few 1911 enthusiast on here. I'm looking to purchase a 1911 as my next gun. Ammo is expensive and I like to shoot a lot. I know it's sacrilege for some, but thinking of going with a 9mm version. I'd prefer to build one, or purchase something cheep and build it up. So the question is how interchangeable are the parts. Obviously the barrel and magazine are going to be different. What else can I expect to be compatible or specific to a 9mm. Thanks in advance for your help.