A sharp knife is essential gear for any outdoor excursion. This week, American Rifleman's Joe Kurtenbach takes a look at a multi-use sharpener available from Bear & Son Cutlery that would make a great companion to any working blade. The Gatco Scepter 2.0 Diamond/Carbide Knife Sharpener is a versatile bit of survival kit, combining blade and serration sharpeners with a magnesium fire starter, all in a lightweight and portable package.