Edga903

So I have decided I want to build my own ar and the first thing I decided to get first were my lower and upper receiver stripped from aero percision ar m5 308 now I wanna choose what kind of barrel I want but Idk if that's the next right step (I haven't bought anything yet I want to be sure I chose the best for my rifle, also I would want to use this gun for close to mid range ) thanks guys I'm looking forward to this build Edga903

So I have decided I want to build my own ar and the first thing I decided to get first were my lower and upper receiver stripped from aero percision ar m5 308 now I wanna choose what kind of barrel I want but Idk if that's the next right step (I haven't bought anything yet I want to be sure I chose the best for my rifle, also I would want to use this gun for close to mid range ) thanks guys I'm looking forward to this build Edga903