Your locking lugs on your barrel should be oversize, so with a swiss file (small fine) star finding where the barrel will not fit into the matching lugs in the slide and file. GO VERY SLOW, AND CHECK VERY VERY VERY OFTEN. You can take metal off, but you can't put it back. When you can slide the barrel rearward with the slide laying on it's back, and the barrel neatly engages, your there.
Start puttin links in and each time use the new longer until the gun will not go completely in to battery. Back off one link. A little goes a long way here.
A reliability tune is pretty routine on a 1911, as they are all the same in construction basically. You go for the common trouble spots, and guys like me have a few extra "pet" spots we like to improve. However, the building of one or some parts changes there may be a lot of tearing down, and putting back together.
An uncle a few years ago, came home with a Kimber. Took it out and it had a tendency for the hammer to follow the slide down to half cock. Was it the sear angle? Nope! They had not cut the thumb safety correctly at the factory, and it was interfering with the sear engagement. Two minutes with a swiss file and problem solved. Understanding exactly how the pistol works is the key.
There is also a myth that if you drop the slide on an empty chamber it will damage a sear and the trigger pull. MAYBE, some hot rod comp shooter with an edge of hell cut sear on a comp gun. MAYBE. If the sear is cut right? BS. Don't make a habit of it though, as it is just good practice to assist the slide to slowly close by hand. Remember, it's metal on metal.