A refresher course for veterans and for newbies to learn about in maintaining their gas blowback pistols in this video by Fishbone Airsoft... "Hello Airsofters! In this movie I will show you how to keep your GBB pistol in order. This is very important lesson and could save you a lot of money if you going to follow it. Remember clean and properly greased pistol could save you from being hit."

Read more about it here.