OK, PS......here you go. It's not hard, just time consuming.
First and foremost.....DO NOT USE A DREML TOOL!
The feed problems with 1911-type firearms can be the magazine, but with older GI 1911's and Llamas, it's usually the step up from the magazine feedwell into the chamber at the rear of the barrel. Roundnose usually feed fine, and anything with a flat on it often hangs up.
Tools needed.....4 to 6 inch 5/16 to 3/8 inch dowel. 200, 400, & 600 grit sandpaper or crocus cloth and a can of compressed air.
First, remove magazine, and lock the slide all the way back. With a small flashlight, look in thru the ejection port and note the relationship between the magazine feedwell and the rear of the chamber. There'll probably be quite a step there.
Field strip the gun, and pin the barrel/chamber back onto the frame. Push the barrel/chamber all the way back and down so it's in the "feed" position. Run the ball of your little finger over the magazine well to chamber interface. You should be able to feel any rough spots, "steps", or sharp or square edges. Note where these are. You want to "radius" these (remove the rough or sharp edges).
Remove the barrel/chamber from the gun. Wrap the 200 grit crocus cloth around the dowel, and very slowly and carefully start to smooth the sharp edges. Do this very slowly......remember, you can always take more metal off, but you can't add it back on!
After you've slightly rounded the worst of the steps or sharp edges, test fit the barrel to the frame and feel it with ball of your little finger. (You may also have to remove a bit of metal from the magazine feedwell.) Then go to the 400 grit and do the same......then the 600 grit.
The idea is to form a very smooth transition from the magazine feedwell into the bottom of the chamber.
It's also not a bad idea to buy a box of the ammo you want to use, and "test fit" it. Load the mag and insert it into the frame. Push the barrel/chamber all the way down & back, and try to feed a cartridge into the chamber with your thumb.
When you get it so rounds chamber well, completely disassemble the pistol, clean & lube it.
Any questions?