When I was in the Army they had us disassemble and reassemble our M16s in a dark room until we could do it in something like 3 minutes. I imagine the Comblock soldiers had to do the same thing with their AK-47s. Constant repetition was the key. I'm sticking with the spring just because Eclips are a real bitch for me to get in! LOL!!! Someday I imagine mankind will evolve into a creature with 3 hands and a telescopic eye.