i have managed to get to the range this morning, had a lot of fun with new and older rifles, tested 4 types of muzzle brakes on ARs and Bergara, so, in the point of 16" PredatAR - it is very decent, but as it heats up, the accuracy goes way to hell. which is OK, with at least 5 sec gap between shots it is not evident, and 62gr 5.56 green tip was grouping quite great.
pictures are shitty as i did it from the spotting scope, sorry.
after zero - that group of 3 in the middle left, ignore others :
and here how group of 20(or may be 25) went in, with 0.5-1sec between shots, rapid fire.
it started awesome - all those hits in the middle, then whole group dropped down-right. last shots were scattered in the bottom. barrel gets really hot compared to stealth.
i still quite like it, but, want to figure out what scope to put on it, i want it very light - and the 1-6x vortex is 22.5oz. may be i will get that 1-8x old razor - it is just 13oz, not sure. will see. from other perspective, it is just 300g difference, and a questionable trade-off.