I don't have a Bushy but I do have a 16" Rock River with a chrome lined barel. I also have an EOTech on mine, and I cannot get the accuracy some people claim to get when shooting that sight. I have mounted a scope on my Rock River and it shoots all the cheap ammo very well. I've never really tried too hard to shoot groups with the EOTech, but when I sighted it in I could put them all in a softball sized group.

I'm just going to take a wild guess its the sight making you think its innacurrate.

PS - I've never heard anything bad about Bushmaster, and I've never even heard of KNIGHT (THE GOD OF ARS)