Hey guys so I've been considering buying or building an ar 10! Ultimately I'd like to have a dual purpose lower and 2 upper one 20" or so and one 16" but I'm unsure of the quality of ar 10 manufactures!!! It seems as though it's way more confusing than the 15's as there are armalite patten ones and dpms ones but I'm not sure which is better.... Any info is much appreciated!