I've got a 597 LS HB. The accuracy is very impressive. Shooting from a bipod with a 6x scope, me and a friend consistently hit upright 223 brass at 30 yards, < 5 seconds per shot.
However, the mags I have do suck. One's the black polymer, the other a dull metal mag. Both mags have been apart, I cleaned and polished the insides, but the springs seem very weak. Many FTF's and bolt closing on the last round. Ammo tested so far was Winchester "X" and CCI Blaser.
I called Remington CS @ 800-243-9700 to bitch about it. No questions asked they sent me two new mags for free. The new mags seem to have stronger springs and smoother motion. I haven't had a chance to test them yet.
As to the fragility of the internal parts, I managed to fully disassemble the rifle after the first 1000 rds, clean it and reassemble without problems. The parts are simple, and fit pretty well. The polymer trigger housing bugged me at first, then I remembered how many polymer guns are in my safe that I paid way more for, and think highly of. I like this gun enough to try and solve the mag problems, it fits me like a real rifle and is plenty accurate. Good luck with your purchase.