I have a Commando style upper with an 11" barrel and 5" flash suppressor. It is marked 'PM' on the upper. It has an A1 upper,forward assist, and shell deflector. I don't know the twist or if it is chromed lined or not. It comes with short handguards. It is in excellent condition with slight handling marks. Will sell for $310.00 shipped obo. I have pics if you email me direct at firstname.lastname@example.org,thanks.