i have a colt match target lightweight a2m4 upper. it is a post ban configuration, no threads no bayo lug. the 16" barrel is maked with C MP 5.56 NATO 1/7. the upper is an a2 with a 4 over the cloverleaf and factory m4 ramps. the barrel extension is marked with a 4 also. It is all colt. there are a couple of nicks here and there but overall it is real great shape. i have plenty of pics i can send. for just the upper i would like to get $450 with a charging handle and a colt m-16 carrier and bolt i would like $575.