The Army established its requirements for the improved carbine effort three years ago. The requirements document calls for a weapon that’s almost twice as accurate as the current M4, according to a source familiar with the document. It also emphasized improved reliability, serviceability and a longer-lasting barrel.
The Army is in the process of cutting its active force down to 490,000 -- more than 10 percent from current levels -- by 2017, but senior leaders announced last year that the service plans to replace its current M4s with M4A1s.
The M4A1 is the Special Operations Command version of the M4. It features a heavier barrel and a full-auto trigger. The Army’s decision to dump the current three-round burst trigger will give shooters a more consistent trigger pull and lead to better accuracy, weapons officials said.
Pentagon Watchdog Doubts Army Needs New Carbine | Military.com