i have an older guy i go to church with thats wanting an 20" ar i have a DPMS 20" a3 upper ive had for years that dosent have very many rds thru it (less than 250) i did use the bolt carrier for a few years in my 7.62x39 upper but other than that its just been sitting in back of safe. i also have an extra anderson complete lower i just finished ( PSA classic lower parts kit and an a2 stock i had laying around). what would be a fair asking price for the upper and lower? im also going to help him get a scope as he says his eyes arent very good. i was thinking maybe $400 range as i dont remember what i paid for the upper and i have just over a hundred in the lower. I just dont want to over charge the guy as hes been a good friend to my parents over the years.