Calibers: 6.5 Creedmoor, 260 Remington, 308 Win. Standard features of Executive Order rifles include Bartlein-blank stainless-steel barrels or Proof Research carbon-fiber-wrapped barrels in 16" or 20" lengths. Geissele Super Dynamic Enhanced (SD-E) two-stage trigger. NEMO patented a recoil-reducing bolt carrier. XO Carbon Exclusive is 38.5" long and 8.2 lbs. XO Steel 16 carbine has a 16" barrel and is 34.25" long and 8.2 lbs.