Remington CSR rucksack rifle

This is Remington's Concealable Sniper Rifle. According to teh Gearscout, this is optimized for subsonic operation and has a 16" barrel.

http://blogs.militarytimes.com/gearscout/2014/05/19/remingtons-csr-rucksack-rifle-2/

From: Gear Scout