I like the Knight's FF RAS. Only negative was the fact that the locking nut loosened up some after about only 130 rounds, but I probably should have gotten on it harder with the strap wrench instead of just muscling it by hand.
That little barrel is suprisingly accurate. I mean, I only shoot this gun at 25m (at least so far), but it does group really well.
Also, the gun ran very well yesterday. I fired 100 rounds from a Beta with zero malfunctions using XM193 ammo. I also loaded one HK Gen II mag with SS109, but did get a malfunction with that, that I think was caused by a weak extraction that did not allow the fired round to be fully ejected before the bolt started forward again. Not sure why -- I may need to put a heavier recoil buffer spring in too if I'm gonna use the SS109 in it.