Hunted this weekend with a guy who was a newbie to duck hunting so got together with him and got out for a hunt. Right at legal shoot time we had a couple widgeons land down and since my friend has never hunted from a layout, I let him get the first shot with his Winchester X3. Soon as he busted out the layout doors, he aimed and...click. He racked another round and... click again. He was like WTH! I improvised with my car keys and a small stick and disassembled the gun and found that the firing pin was sticking really bad. I asked him what he used to lubricate his gun because it was REALLY greasy as if someone lubed the bolt with bearing grease. He said he cleaned his entire gun, including the bolt with Frog Lube. I attempted to clean the bolt with bottle water and lake water but nothing would get that firing pin to smooth out. Long story short, beware of using frog lube on internal parts. Frog Lube is a surface protectant and the pasty film caused the firing pin spring to develop rust which coated the pin shaft, causing the pin to stick enough to absorb the punch from the hammer. Once we got back to the trucks, we cleaned the bolt with good old remlube and now it works great. He even shot two ducks using my Mossberg 935 (I never clean it) ;D