Hello I have for sale an excellent condition mrp 16" piston complete upper for sale. According to the guys at lmt this is a nice early mrp quad rail upper with the "patent pending" marking. It is a semi cut carrier. It was rattle canned green and still has some paint left. I gave it a good soaking with citrus stripper and scrubbed it for a while but still shows some paint as seen in photos. Located in Peoria or goodyear.