Need some advice!

I have a used complete factory Colt 6920 leo M-4 upper that I'm thinking of selling. The upper has approx. 1200 rounds down the pipe with the usual wear on the charging handel and case deflector. The upper has all of the Colt markings with the M-4 stamping on the front upper area of the reciever and has the T- # markings under the carry handel ( which would be included ) . The receiver also has a C and key hole stamped on the right side. I would say the upper is in good condition ( on a scale of 1 to 10 it's a 8 ) . I was just wondering if anyone has any idea of what a fair price would be ? Any help would be great !

Thanks,

1981

'bout $500, IMO

$500 seems a little on the low side of the range, but in the range none the less.

I was thinking $550.00 with the M16 factory bolt carrier.