right now Im working on a lock controlled by fingerprint... this idea locks the gun down, allowing no ammo to be loaded without a fingerprint... cant really say much more, but... when you see it on the market you will say holy crap i know who made that. right now i have a demo and a few gun guys that are looking for all the flaws with it.
I wish you luck with your idea, but know that it's been done in several ways already and none have caught on for mainstream or commercial/ LE or Military use. Add the cost and the facts that with a bit of time, any thief with tools could remove or destroy the lock and that many gun owners (Me, for one) will never, ever add on or buy such a handicapping device and you'll have a challenging road ahead.
Oops- Bloody fingers, weak hand, bad battery, dropped in the mud= Expensive rock.