The big advantage is the lack of an operating rod, the guides for it that have to be pinned to the barrel and any piston or tappet needed to drive the op rod. The effect is to freefloat the barrel, which, in most barrels, is good for accuracy. The bolt has seven lugs, spaced as if there were eight, with the extractor taking the location of the eighth. The lug symmetry also acts to increase accuracy, as it limits the amount of bolt tip under the load of firing.
The upper and lower receivers are made from aluminum forgings, and the handguard is turned aluminum, all impervious to the weather; climate changes will have no effect on accuracy or bedding. Additionally, the R-25 has a Mossy Oak Treestand coating, so if you aren't careful in the woods, you may spend some time hunting for the rifle you set down while doing something else.