Check them out new here.
http://Www.mgi-military.Com
Go to store and look for the upper in the list. Not sure why I cannot paste link in here on phone... picture of mine below.
They sell for $600.00 new without CH (or BCG). Asking $500.00
This one is like new. Had a couple different barrels on it, 7.62x39 and 5.56. Worked well with both, other than magazine issues with the commie ammo setup.
Great shape, kept in safe. CH is a stock MILSPEC from some rifle I upgraded I am sure.
Website has more info, but you could use your same upper/ lower combo and convert between 7.62×39, 300BLk, 5.56mm, 6.8mm SPC, etc. Swap barrel, swap BCG and move out. MGI has a modular lower as well, and kits for many different calibers.
No trades at this time. Daddy needs dollas for bills. If not sold before I will be bringing to the upcoming shoot.