I bought an XM177-E2 clone a couple months ago. I like the way it looks and shoots (1/2" groups at 50 yards), but the front sight base was canted to port.
I stewed about it for awhile and decided to send the upper back to Troy. They sent me a new upper, and the replacement upper's front sight base is canted about the same to starboard - disappointing. The finish doesn't match my lower now either, but it's close.
It's functional, but I even though this I bought this rifle mostly to look at, I expect it to be assembled correctly. While it functions fine and is zero'ed, having the rear sight adjusted almost to the limit does not present a natural sight picture when shouldering the rifle. I guess I could give Troy another chance to fix it (again), but I'm not confident they will get it right the third time.