The outdoor range ended up being closed last week for a private match. So, I went to another outdoor range that was only 100yd, and ended up shooting 50yd the entire time. I did find out though for some reason that I am able to bump fire this setup when I couldnt really bump fire with the other upper. I thought that was only dependant on the lower (trigger and all), but for some odd reason I can even accidentally bump fire with this standard bushy lower and the gas-piston upper. If I hold my trigger finger a certain way after firing, it just continues to rapid fire. Pretty cool, although I did get yelled at twice at this other range where rapid-firing is not allowed (it was a shitty range). I'm going to get some videos up at the end of the week when I go to my regular range again. I could bump from the table with bipod and also from the shoulder.
The way the predator rail system attaches to the upper receiver is much (exactly?) like the KAC RAS. It is a one-piece FF system that mounts to the barrel nut area and the flat-top upper receiver. The receiver and barrel basically slide right into it, and then you tighten the barrel nut area using 5 allen screws. 2 on the top rail, 1 on each side, and 1 on the bottom. At least that's what I think those are for.
I dont see why people say the predator is "too big". I think it is perfect. It is very light for it's perceived size, and the slight height increase on the upper receiver makes it a lot more comfortable to look through my scopes and get a nice small chin/cheek weld on the stock. The sides are not all that much wider than most rails out there, and they seem to stay as cool as my Larue 9" on my other upper. It is very easy to shoulder and does not appear to be any heavier than my other upper with the Larue 9" and troy sights.
I'll post some more on this thread at the end of the week. Videos and pictures.
- rem