Stolen from a metallurgist: 885 degree embrittlement of #416 SS, being tempered in the range 750-1,050 Deg F a region where its resistance to impact markedly decreases, along with ductility, electrical resistivity and corrosion resistance. Martensitic SS as #416, show pronounced brittle behavior at low temps. All steels of martensitic or ferritic pass through a transition of ductile to brittle as temp falls. The ductile to brittle transition of #410 and #416 SS tempered to Rc 30 go from 200 Deg F to-50 Deg F. In contrast #4130 chrome-moly steel shows a ductile-brittle transition at -100 Deg F or lower. The relatively brittle behavior of SS at cold to sub-freezing temps is not widely known. Krieger barrels refuses to make sporter weight bbls from #416 via metallurgic advisors(2001). #416 contains @ 12-14% Cr, 0.15 or more Sulfur, 0.15% Carbon, 1.25% Manganese, 1% silicon, 0.06% Phosphorus, and the rest Iron. The Sulfur was first added in 1928 and was found to make SS easier to machine giving easily removed brittle chips and better cutting rates and tool life. Unaltered SS (Martensitic)is very difficult to machine.-------Now weather this makes you change your mind about carrying a SS arm is up to you. I still use a light weight SS rifle but it is interesting to know the facts about SS. I haven't heard about a failure but saying "well thats never happened before" doesn't help if there's a piece of SS sticking out of your eye.