I appolagize if ive accidently invented a gas system that dosnt exist but thats the part thats really fucking with me. Ok so ill be ready probably this friday to buy my upper and finish my ar15, so ive been looking around and holy shit there are way to fucking many choices im lost. as of now im leaning towards a car A4 upper ( manufacturer i dunno ) I like the barrel profile. I don't want a gernade launcher mount on my barrel. so now onto the 11ty billion options / choices . Should i go with a full length, mid, or carbine gas system? Should I spring for a detachable carry handle? ( eotech in the future ) or a flip up rear sight? What do i do about a rear sight? Im more interested in makeing my parts go bang right now than spending 400 bucks on an optic. I like the way the midlength handguards look is there a differance other than asthetics? HALP ME!! as i mentioned a few times before this is going to be a fighting rifle SBR at some point but right now im going to stick 16" barrel on it and start saving for the nfa shit. think CQB when makeing suggestions. I like the way this upper looks ignore the removable carry handle for the time being as I dont know if that the route I want to go. Can anyone tell what I would say to purchase something similar?