Ah the Afghani strategy.

Where there's a will there's a way.

Personally I'd choose a grenade pressed against my skull. No chance of survival when your brain is quite literally puréed

Interesting, how would that work? An extra trigger you need to press before it fires which you can't reach? That would seem like a hassle on the battlefield, if that safety would make it even the tiniest bit more difficult to fire when an enemy approaches.