Re: 50 BMG upper - AR lower
Tactilite uppers are very, very good and have Great fit and finish. I had one for a couple years, before I decided to sell and go to .338 Lapua. Mike, the owner will pick up if you call and is super nice guy to talk to. You would not have any regrets if you go with one of these. The other makers of uppers seem to have everything down pat also, so nothing negative to say about any of them. There was an incident with one upper exploding, but it came down to the operater and his reloades.
As far as the AR lowers not holding up to the Big .50, I challenge anyone to find proof one has failed? Your not going to find anything!