That BB Guy got this list to explain to you the five reasons that your gas blowback airsoft gun canno mag dump... "Does your gas-blowback replica have gas efficiency issues? We are going to look at 5 reasons that this might be the case. Although some airsoft guns are absolutely terrible with gas efficiency, there are things that you can do to help. If you have any of your own tips, go ahead and leave them in the comments to help others."