The Rangers were showing off their new SCAR rifles on the weekend.
Rangers from 1st Battalion, 75th Ranger Regiment, Fort Benning, G.A. stand at attention on the infield of the Lowes Motor Speedway as they are honored for their service to the nation during the Coca Cola 600 NASCAR pre-race military appreciation show in Concord, N.C. on May 24, 2009. (U.S. Army photo by Trish Harris, USASOC News Service)
A large high resolution version of the photo can be seen here.
Can anyone tell me what the device attached onto the muzzle is? I am guessing it a device to prevent the gun firing or chambering a round?
Hat Tip: Defense TechRelated