Has anyone used the Vltor MUR-1A AR Upper? I really want to replace the upper on my S&W M&P15 Sport with something that has a dust cover and forward assist and everything I've read on this suggests its pretty awesome.

The upper receiver on my wife's Noveske is a VLTOR MUR. It's pretty nice. Our goal was light weight with her gun, so we ditched the forward assist. IMHO, it's extraneous and unnecessary, if not dangerous. If you can't chamber a round with the depression on the side of the bolt carrier, just eject it and try the next round. Using more force really has the potential to make things worse. Either there's a problem with the round, or the gun (or your thumb!), and forcing it could result in a stuck case, or depending on what is making it difficult to chamber, even a KABOOM.

I used one on my Frankenstein and was happy with it. No issues with it. Not really sure it's worth the extra money though as I bought it because that's what was in stock at the time.

LOVE mine. no problems besides them being TIGHT

Awesome now to find who's got it cheapest right now.