This small A2 receiver upper came from a model 6601. It has A2 sights, 1x7 twist colt chrome barrel, A2 flash suppressor, no bayo lug. Price is $315 shipped. Additional $100 for charging handle, bolt, bolt carrier. Additional $25 I will include an HBAR front sight with bayonet lug. Very rare. Purchase what you want.
1) Upper receiver with barrel assembly - $315 Shipped.
2) Complete upper receiver with CH/B/BC-$415 shipped.
3) Same as two above with added front sight for hbar with bayo lug $440 shipped.