I played the modded Duck Huck rom (beta 5) on my OG NES front loader with an Everdrive N8 and Tomee Zapp light gun through composite on a Sceptre-brand 1080p 40" flatscreen.
I haven't tried the Nintendo Zapper yet, but the Zapp gun works unbelievably well shooting 2 ducks. I easily got to round 8 and I could have gone farther, but the Zapp has an uncomfortably short cord at about 5 feet, and it doesn't seem to work with the 4 score as an extension cable, so I just let the game end, so that I could try clay shooting before setting up my NES in a more comfortable spot.
No wrong ducks ever died. Every time I felt like I was on target, the correct duck would die.
So that was amazing. Here's the weird part: I couldn't hit a single clay pidgeon.
So I messed with the settings a bit. I hadn't messed with the delay at all yet. Even after messing with the delay a bit, I can't get clay pidgeon shooting to work, not a single hit.
Still, as a proof of concept, especially with auto delay calibration, this is mind-blowing.