Painful, sore, red gums can be a symptom of gingivitis (inflammation of the gums) or, more likely, periodontitis (inflammation of the attachment fibers of the teeth and supporting bone), which can arise due to a number of different causes.
klick (plural klicks) ( 1 slang, military) A kilometer. 2002, Robert J. Sawyer, Hominids an asteroid between one and three kilometers wide had slammed into the ground at fifteen klicks per second. ( 2 slang, usually in the plural) Kilometres per hour.
Rancid Coolaid wrote: To each, his own. The primary benefit of the mil over the MOA is consistency. For your MOA scope, a 1MOA correction is 4 clicks at 100 yards but only 2 clicks at 200 yards. For a mil-based turret, a 2-mil correction is a 2-mil correction, no matter what range. I learned on mil dot scopes with MOA turrets and can do it just fine, but I must admit mil-based systems are simpler.