I just was looking at my Armada/MMULE mag, thinking of possible anno , and my bolt in the Sub-zero feedneck has some rust starting. Yuck!! I hate the humidity in Fla. Can someone advise me of what size these are so I can hunt down some Stainless Steel? Rouge? Help, I can't have cancer starting on this beauty. Looks kinda 1/4 x 20ish. ooooogh yuck it's starting on my grip screws too, Ahhhg, run screaming into the woods! Luke? 6-32ish? on the grip screws?