Nice upper receiver and the correct color.
I'm building four upper receivers, two in .223 Wylde and two in .300 AAC. I'll eventually need to buy two more upper receivers to finish my project. I have another one, that has a different foundry mark and has T-marks along the top. The one from Gorilla Machining isn't quite that fancy, but is fine. Also, the barrel socket is not quite as tight as the other upper receiver. For that one, I had to heat the receiver to expand the metal so that I could install the barrel. This one is snug, but not an interference fit. Good, or bad? To me, it doesn't matter that much. Everything else about the upper receiver is perfect. Good finish, no blemishes that I could see.
Reviewed by: Charles Shoults from SIDNEY, NE on 5/31/2020