Originally Posted by CJx
I thought AKs are gas piston, which channels the gas out a different rod away from the action?
Yes they have a gas tube and piston. Some of the gasses get vented out the sides most of it comes back into the reciever bolt area. That is what you don't hear about because the akophiles aren't interested in how the gun actually works just in promulgating myths and rumor to make their choice in rifle feel better.
Gas in all semi autos also come out into the chamber and bolt areas from the barrel itself as pressure isn't fully released before the bolt is unlocked and fully cycled to the rear but that is very minor. You can see it happening at night if you thinking I'm fibbing you. Flame (hot gas) will exit both an ak and ar15 piston or di from the bolt area.
The gas piston doesn't fully seal the action on a ak47 from the hot gasses there no gas rings to prevent that like on a ar15. Yes gas and carbon does hit the lower reciever parts in a ar15 but the critical bolt area is sealed from those self same gasses. What gunks up a bolt face and locking lugs is blowback from over gassing. You get this from guns like dpms bushmasters and lots of other budget guns. Not all ar15 are the same.
So you have some gas out the sides and some in the reciever.
Piston ar15 run cleaner but its a non issue.
What's important is proper lubrication. Your more likely to experience stoppages or failures from broken parts due to lack of lubricant tham jammed cartridges due to fouling.
Ar15 are good rifles so are ak47's its really a toss up just comes down to personal pref on which controls you like better.