When you run out of gas, batteries, BBs, or your airsoft gun just went kaput, there's not other option for you to stay in the game but to do some "knife kills". A training knife, whether it's rubber or plastic is a helpful tool for you do some thrilling gotcha moments in airsoft games. Airsoftology talks about plastic training knives... "Forget bang-bang kills, the real challenge is getting a rubber knife kill... and this is just the tool for the job."