Can't make up my mind between Carbine and Mid-length...

yup, that upper
i'd let it go for 350 cash or could ship for extra cost of UPS shipping

Thanks for the upper with great price but sorry I'm looking for different kind of upper tho. One's with forward assist and as close as possible to military-spec design.

I will ask some people around me here if there is anyone who wants to buy it

not needed, i'll list it up forsale on the local sites whenever I get the parts i've ordered for the other build i'm doing.