I'm not new to 1911s but I am new to working on them. I recently became the proud owner of a Kimber 10mm 1911. I've shot 1911's for years but have never modified one at all so I don't know a lot about that aspect of 1911's. Because of ammo costs and other reasons I'm interested in setting it up for.40 Cal ammo. I've read it's an easy thing to do because depending on what you read it's either just a barrel or a barrel and a spring. That's a long way of getting to my questions. Is there such a thing as a good drop in barrel? If there is what brands should I look at? Is fitting a barrel as difficult as some people say? Thanks for the help.