This is how you will go Airsofting with K'nex. It is pretty easy.
Are you ready?
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Step 1: What You Will Need
Any piece of K'nex (Head's go on top as an arrow or get creative)
Grenade (see link)
The link https://www.instructables.com/id/ACTUAL_WORKING_KNEX_FRAG_GRENADE/
Shooter (see video)
Step 2: Have a War
You can be in an indoor or outdoor place. You can also be using both at the same time. Use your launcher and hit your friends. If they get hit 10 times, they die. A grenade counts as 2. As in, if you hit one friend with 5 grenades, they're dead.
Step 3: Thazit
I might upload more but otherwise...