Mid State Firearms - Ar15 Mfg
This is one of our newest products. It's one of the first I've seen that has a side-charging handle that doesn't move back and forth while shooting. I like that because you don't have to worry about the handle hitting anything (post, tree, arm, hand, whatever) and possibly stopping motion of the bolt.
There's a few other non-reciprocating uppers out there. They're all a bit pricey. This one has a dust cover and forward assist which sets it apart from most of the others.
It can also be used with any standard bcg, no special conversion needed.
Non-Reciprocating Side Charging Billet Ar15 Upper with DCFA