Meet this impressive Double Barrel Knife Launcher by the guys at Slingshot Channel. They have used a M16A1 rifle (deactivated of course) and added a two shot knife launcher to it. It mounts underneath the barrel of the rifle. You can shoot both knives individually or at the same time.
Double Barrel Knife Launcher for the M16 Assault Rifle
Impressive, isn’t it?
[YouTube]
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