US Army us looking for Compact Semi-Auto Sniper Rifle. This seems to be an attempt to find lighter weapons for SASS which is currently Knight's Armamnet's M1100
The Firearm Blog has a detailed look in to this.
http://www.thefirearmblog.com/blog/2014/06/16/army-releases-draft-rfp-new-compact-semi-auto-sniper-rifle/
From: The Firearm Blog