Retractable stage knife in airsoft?

You know, one of those retractable fake knives. The idea just popped into my head out of no where and i tried googleing it but nothing came up. Its safe and it could be like an instant kill thing? if they aren't used, do you think they would let you if you checked with them, and how cool would it be to just go knifing people around? Just to ensure them it is a fake knife, the handle could be wrapped in neon-orange duct tape which can be bought at most craft stores, or the tip can be painted orange. I was thinking this could possibley replace the "BANG" or "SAFTEY" rule where you shout out. This would give away your position if you were a sniper or the last remaining player. So knifing could be like a silent kill. What do you guys think? Would they allow it? Do they already use this technique? Do you think this idea is really cool? :D and yes i am a CoD addict which is mainly why i came up with the idea





P.s. i already asked this question but only one person answered so i tried in another category.|||That is a great idea, but retractable knives are really hard to find. why not jst use those rubber or plastic knives instead. they may not look cool but they are safe and they work.