I've used finger cots for years to keep debris like snow outta my gun barrels when hunting in heavy snow. Folks that hunt after a big snowstorm in the woods know snow from brush and trees may fill the barrel or crouching in deep snow may make for an unintentional barrel plug. Wet snow/rain and a cold barrel can make for a ice plug that's hard to remove in the field and a 'ell f a lot more dangerous than a finger cot. The cots easily shoot off and generally you find them downrange without a hole in them. I assume this is because the moving air in front of the bullet blows them off the barrel before the bullet gets there. I remember my dad telling me they used tape over their barrels on Iwo to keep that black volcanic sand outta them.
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