A buddy of ours bought a Barrett REC7, which I'd never heard of. It's piston AR (I've got no idea why we're still chasing the piston AR idea, but whatever)
We didn't get to run it too hard, and only ran it suppressed. But it's a pretty nice gun and shot some MOA groups (barrel not even broken in yet)
Not enough round through the gun to see if any of the usual piston problems pop up. The gun was noticeably quiet with the can on. Almost quieter than a regular DI gun. We didn't mess with the gas adjustment, but it's up there and pretty much like what you'd expect to see.
Gun comes with Magpul grip and stock.
https://i.imgur.com/xMVE30K.jpg
Weird to feel a bolt with no rings. Feels loose and makes me want to fix it. BCG and Charging handle:
https://i.imgur.com/2T0XRWQ.jpg
The trigger is pretty nice. Reset is almost too light. It's crisp, but it feels almost too fragile.
https://i.imgur.com/38YU4R6.jpg