Coming back to something that was discussed, I think there's definitely a market for a very realistic, non-violent shooting game. In other words, the equivalent of Microsoft Flight Simulator: unlike most flight sims it is explicitly non-violent (no combat involved), but having a flown an airplane after playing Microsoft Flight Simulator, I was amazed at how realistic Microsoft Flight Simulator is.
Naturally building this game without including AR-15 variants, would be like building a flight simulator without including the Cessna 172. I'll readily back this on kickstarter: it's a way to get break both the "guns == violence" and "video games == violence" memes, get more people interested in target shooting, and it would be valuable to sport shooters.
(Probably worth starting this as a separate thread in OT forum)