Unfortunately I have to sell my 450 Bushmaster upper. I have put 1 box ammo through it and love it. But there are bills to pay so I must let this go for now. Factory 16" Upper and Mag as purchased with bolt and carrier. This posted on other boards so it's first come first served. $ SOLD plus $20 shipping located in southern PA north of Baltimore if you want to pick it up. kazmij2001@yahoo.com