well i got a 30 dollar pistol and a 50 dollar shotty to start with and im still using it for about 3 months now and it works fine for me and my friends...if ur not looking to go crazy serious i suggest online stores and yes e-bay
non blow back. a quieter, more gas efficient gun. itll also tend to get more power. but the slide doesnt blow back and (to my knowledge) wont lock when you run out of ammo.