Welcome to the world of the AR-15! Without a doubt, the AR-15 and AR-10 rifles are two of America's most popular semi-auto long guns. Every day, new shooters are exploring these durable, reliable, and accurate rifles and finding new and fun ways to use them. Now, in the Gun Digest Shooter's Guide to the AR-15 , author Richard Mann examines what has truly become the most versatile rifle in America. Inside you'll find: Gas impingement vs. piston systems–which one's right for...
