AR-15-pattern arms perform best with proper cleaning and maintenance, and Otis Technologies is a leading source of portable service kits for those, and many other, firearm platforms. The MSR/AR Cleaning System is a comprehensive kit that, in addition to more generic cleaning supplies, includes AR-specific brushes, scrapers and tools for servicing areas and components such as the “star” chamber and bolt carrier group. The system even includes the Golden Bullseye Award-winning B.O.N.E. tool, all in a small, zippered carrying case. Price: $70. Contact: Otis Technologies; (800) 684-7486; otistec.com.