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Interesting new note. Recently I discovered with the help of a good Chrony that my AK47 with metal bushings and a M120 was shooting over 440/450fps. Spring and bushings were the only changes.
Since the filed rules where I play called for much saner power, I changed the spring to a PDI150. I was still over 400, averaging 420fps.
Now I've almost gone full circle; stock spring, stock piston, stock everything except the metal bushings. It shoots at 300-310 and still has a great range and accuracy.
Moral of this story? If I had just spend the $20 for bushings in the first place, my gun would have served me much better and been much safer for all (also a LOT cheaper for me).
What other good came of this? A lot of people I know are completely changing their view of upgrades and going for better parts like bushings, pistons, gear sets, and springs below the PDI150.
The results are quite educational.
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