So, from I've deduced here is that the reason assault rifles use Direct Impingement or Short Stoke Gas pistons is that the blow back gas needs to be "metered" because of the high pressure cartridge used? In order to not send the bolt back to fast? Which would happen with a recoil system using a high pressure cartridge?
Sorry for being a dunce. I am a deep thinker and I do really want to understand exactly how the action in the different systems work. I want to completely figure it out.
I've been looking at getting a AR type rifle and I was comparing Direct Impingement to Short Stroke Gas piston guns. And then I thought, well what about my .22 cal. Marlin Model 60 semi auto, and the S&W M&P 40 I have? Why do the assault rifles use gas tubes and such and these guns don't? I own a total of three guns. The two I mentioned and another Marlin .22 bolt action my dad gave me when I was 13 years old, back in '76.