This came off a lower model SP1, serial # 145,xxx. On the receiver, below the back of the carry handle, it has a "C" and "M". Near the barrel on the right side are what appear to be two forge marks; a faint circle in a square symbol and an even fainter triangle. 20" pencil barrel. On top of the barrel, it is marked "C MP Chrome Bore"
Some parts have been replaced. A3 charge handle and flash hider. Bolt assembly is aftermarket. Front sling swivel has been replaced along with handguards. There is a bipod attachment on the current handguards.
This upper functions flawlessly. I swapped out a flattop upper for 3-gun shooting. Shows some scratches and wear but nothing bad. Has been used but not abused. Perfect for building a Retro gun.
Not interested in any trades. $350 as is with $10.00 shipping to the lower 48. Will accept money order or cashiers check.
Sorry, I do not know how to post pictures. If you email me, I will email you pictures.