Reply #14: I think the hardware/software could be made as reliable

[left15]

as the gun, you may need to replace the electronics for every 10,000 rounds fired or something, but I don't really see how you will get bio-metric data consistently enough to verify the user. It will have to be done by grip/hand shape, which can change depending on the shooters position.

I suppose if you put enough "slop" in your readings, you could get it to work consistently for the user, and half of the non-users.