Re: Rem 597 22lr
The other common tweak is to make sure the guide rod bolts aren't too tight. Take the action out of the stock, and loosen the two bolts that hold the guide rails in place (on the back of the action, looking at it from behind). Then tighten them until they just seat, almost finger tight. Some 597's have had overly tight guide rods, and they will tend to bow a bit, which can effect feeding and cycling. I put just a touch of rem oil on the rods. Most don't respond well to excess oil.
I haven't had any problems with mine, apart from the first set of magazines. I have probably shot around 3000 rounds at this point, with no FTF or extraction issues. I like the feel of the 597 vs. other similar rifles for overall fit. Out of the box, it is fairly accurate (the consensus seems to be that it beats other rifles in the same price class and I would agree).
Don't bring Skittles to a gunfight.