"this was my first gas pistol and let me say I was impressed. i bought it off this site for 90 bucks and i got an extra mag. The gun is good but the mags arent. In 5 months of using this pistol both mags got a leak in it. I do use propane, but i am very good about useing silicon regualy. After the mags broke i was sad, but i ordered the extended mag for the hi capa series. good mag but also broke in a good 2 months. maybe the propane was breaking these mags so if you get this gun or any other hi capa series GBB use green gas"