There is a very simply way to prevent the need for you to spend hours on your hands and knees looking to tiny springs, parts, screws, etc. from guns and other mechanical devices when they are being worked on, (ask me how I know).
You can make up a cardboard box (preferably with a white colored inside) and cut two holes for your hands to go through on the sides. Use a piece if plastic wrap or plexi-glass over the top and you now have a captive space to work on your gun so that when the parts go flying, they can't fly out of the box. The white interior of the box makes it easier to find the small parts. Once you have removed those tiny elusive parts, you can remove the gun from your box and continue normal bench top work on it.
Of course this will take all the fun and excitement of spending hours on your hands & knees away, but I'll bet you could possibly handle that.
Chief38