Jonathan Higgs of Airsoftology goes over the WE Airsoft G19 (Glock 19 replica) gas blowback pistol which fires at 300fps which he says gives him consisten shot groupings when he tested the pistol, even at 45F degree weather outside. The version that he has is the 2-tone/tan version and he says that they can go up to .25 or .28g BBs which you can dial-in the firing of these heavier ones with the adjustable hop-up to be able to hit man-sized targets at a good range.