First I would like to make this abundantly clear. I will not tolerate any bad mouthing of my AR. Please save it for another treated. This is a question and answer thread plan and simple. My AR has been Very good to me. and I have put thousands of rounds thru it with out a hiccup. I have a Bushmaster C15, Now that you know what I have on to the question. It has a 16in Barrel on it, I am aware a normal AR barrel will not fit. I am mainly a long rang shooter, Therefor I want a longer barrel. Does any body know who if any body other then bushmaster makes a longer barrel? The longest BM makes is 20in. I would like to go a smig longer then that. certainly with the number of these now in private hands some one has to step up to the plate. By the way the Timmney trigger works wonders And before anybody wonders mine is the latest generation all the past problems have been fixed the thing is a tack driver and I adore it.