Webb County Sheriff Martin Cuellar unveiled 15 enhanced rifles for the patrol division, authorities said Thursday. “The existing M16A2 rifles are heavy and with a barrel length of 20 inches.

Army and Air Force personnel were instructed in the use of the ACR rifles, and the M16A2–which had been the standard service rifle since 1982 – was used as a control group. The Army put the ...

The M4-series Carbine achieves over 80% commonality with the M16A2 Rifle and replaces all M3 .45 caliber submachine guns, and selected M9 pistols and M16 rifles. The Army is pursuing a two-phase ...