Finally! A truly rigorous torture test of the most popular AR-15s and accessories! With AR manufacturers branching out into nontraditional calibers, and continual advances in optics, ammo and associated gear for the AR-15, Gun Digest Book of The AR-15, Volume 4 brings you up-to-date on the latest developments, including chapters on:

• .223 vs. 5.56: What's the problem?
• Various .300s of the smaller-than-.308 size
• Wilson 7.62X40
• The .17 HMR

In Gun Digest Book of The AR-15, Volume 4 author Patrick Sweeney hits the range and subjects the ADCOR DI carbine, SIG 516, Del-Ton, Stag Arms and other AR-15s to some serious testing. To find out just how much abuse they can withstand, he buries them in dirt and sand, submerges them in water, drops them from heights, runs them over with trucks, then freezes and blasts them with a shotgun! And then he shoots them, documenting the entire process in photos! Kick back and watch in horror as events unfold and find out which AR-15s survive the torture test.