>>5984691As anon said here, the exhaust from a gyrojet will not burn the user.
You can see that this pistol is full of holes, to allow the gyrojet's exhaust to escape.
Naturally, it'll engulf your arms and cover you in a spray of burnt gunpowder, but it won't burn you.
The gyrojet accelerates quickly enough that you aren't exposed to the flame for long, just like waving your hand through a candle flame.
