I've got a couple for rifles.
A snap on screwdriver type and a torque leader dial gauge mini wrench.

The screwdrivers are very convenient - but the £200+ Snap-on driver has failed twice on me leaving fastenings being done up way too tight till I noticed the error.
I've since reverted back to my old dialed mini wrench (which I picked up from an autojumble for £40). The advantage of the dial is that the torque is always being read out meaning you've got a bit more control and feeedback than with the clutch slip type screwdrivers.

The wrench is like this one link and I'd thoroughly recommend.