My LMT was purple, too, although it seems to have slowly become a little less purple with use and cleaning. I was sorta surprised too, considering how much more they cost.
What was really a surprise, though, were all the sharp edges and sloppy tool marks.
Especially compared to my RRA lower.
On the plus side, the lower of course works fine and the finish seems to be a bit more durable than some of the other offerings out there. Fit with my uppers has no play at all, but you can still work the push pins.
I can't figure out what exactly the problem is, but a lot of uppers and lowers these days have a black finish that easily chips off, and seem have softer metal that shows accelerated wear in places like the charging handle latch detent and the place where the ejection port detent strikes the upper. I suspect some of those receivers are not actually hardcoat anodized.