Reading post 442717 in main thread: Sniper News.
August 7th, 2008  
A Can of Man
 
 
The K2 is used for the DMR role and in that case the shooters play with the gas system to turn the automatic rifle into a bolt action weapon. It makes it a far more stable shooting platform and also reduces recoil (at least it seemed that way to me).
 
 
(c)02-10 Military-Quotes.com - Post # 442717