nice looking versions , and are the result of the "batch" made up for the casting and the mix was NOT stirred/mixed enough, too much of one type of metal in the 4140 chrome -moly "batch" being too close to the surface and will NOT take a blue, will not darken, and thus cause the lightning like streaks in the surface metal (casting) most gun makers frown on this happening as it is a "defect" and folks like Winchester collectors hate it but some of us Ruger collectors just gotta love them "defects" ( did NOT like to see "plum" when we owned the bluing company back in the 70s, those parts went back in the tank, again, a defect in the bluing process most of the time, but NOT in the case of the Ruger castings of various parts, it was the "mix" of the metals ingredients............blue it , it will turn red again down the road,,,ultraviolet light can speed it up........Winchester chrome steel parts ( ala barrels) turn up the temp at the end of a bluing bath run (cycle), and re run it a couple of times and the chrome barrels would turn blue, and stay blue...........:unsure::cool::rolleyes:;)