With manufacturers branching out into nontraditional calibers, and continual advances in optics, ammo and associated gear, for the ar-15 this volume brings you up-to-date on the latest developments in the industry. .223 vs. 5.56, various .300s of the smaller than .308 size, Wilson 7.62X40, the .17 HMR, ADCOR DI Carbine, and SIG 516. S/C. 286p.