i`am looking into the noveske 20"stainless steal bull barrel(5.56) for an upper build.i haven`t heard anything on it as far as accuracy.etc.it states it has a 5.56 Noveske Match Mod 0 chamber .does this barrel require a matched bolt?i tried calling noveske,but my call went to a voice mail that has gone unanswered since friday.any and all information is appreciated!