We have some Bushmaster LEO rifles that are shorter than the M4s at the office. You would refuse to believe me if I told you how accurate they were......don't ask me why, I cannot explain why they shoot so well. Our Bushy M4s do about 3" MOA at 100 or so. The shorter entry guns, well, they keep up with heavy barrel scoped bolt guns....again, I have no explanation and neither did Bushmaster directly.
RR