Any idea where to get replacement orange target stickers?
I was using the stick on shoot n see's for a while, but started to just spray paint the paddles, that's a heck of a lot less expensive.
Would this be able to be used at 15' (5 meters) with pellet pistols shooting at 425 fps and less?
Yes, it should work without an issue.
Does it work with airsoft? Specifically high end green gas replica trainers.
It should work, but you'll want to wear eye protection as the BBs will ricochet.