I am planning to pick up a new AR and would like some input on make.? I am a left hander but learned in the Army 30 yrs ago to use a right hand weapon , left handed! . I am going to get a right handed so when I leave the earthly bounds my son or daughter may inherit this fine weapon. I do not like the .223 cal. and want the 6.8 but I do have a few questions. This is the same as a 270 cal but is it a true 270? meaning can you use 270 in it? if not that is ok I still am getting it. Now what make does everyone have and what are the pros and cons. looking at a Stag, Bushmaster,DPMS, Smith Wesson. are there any real differences in lowers and uppers? I need positive input to base my decision on.