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M4 carbine upgraded to M4A1
[PM] A new U.S. Army video shows how today's standard infantry weapon, the M4 carbine, is being updated to perform better on the battlefield. The Army is gradually converting its entire inventory of M4s to the improved M4A1 standard.

The M4 carbine is the standard issue weapon for the U.S. Army. Introduced in the early 2000s, the rifle has performed well in Iraq and Afghanistan. In a 2006 report prepared for the Pentagon, 89 percent of soldiers polled said they were satisfied with the performance of the weapon, the highest rating for all Army small arms.
Posted by: Besoeker 2016-07-09
http://www.rantburg.com/poparticle.php?ID=461096