Description NEMO full ambi-control upper and lower receiver set billet 7075-T6 Cerakote tungsten grey The only large frame AR with patented carrier recoil reduction system Lightweight design incorporating truly functional aesthetics Geissele Super Dynamic Enhanced (SD-E) two stage trigger First stage 2.3lbs Second 1.2lbs carbon fiber barrel 20 inch lightweight Proof Research Two-position adjustable gas system for suppressed/unsuppressed shooting NEMO dual chamber compact muzzle brake 6AL-4V Titanium 15a ^2 6061 M-LOK modular rail 1.83a ^2 internal diameter steel QD mounts rotation limited If you're considering a .308 patterned AR platform in calibers other than the tried and true .308, then look no further. The Executive Order (XO) in 20-inch trim is a lightweight, accurate, hard hitting carbine. Available only with a 20-inch Proof Research barrel, you can choose between .308, .260 Remington, and 6.5 Creedmoor chambering to fit your shooting needs. The longer barrel ensures that you can extract maximum velocity from your projectiles. Ambidextrous controls make operating the XO a cinch for any shooter. *Product configuration subject to change without notice* NEMO full ambi-control upper and lower receiver set billet 7076-T6 Cerakote tungsten grey 15" 6061 M-LOK modular rail 1.83" internal diameter steel QD mounts rotation limited Lightweight heat dissipating barrel nut 7075-T6 7075-T6 7 position "Carrier Cradle" anti-tilt receiver extension Tuned steel faced buffer system Chrome silicon recoil spring PROOF RESEARCH 20" 1:10 twist carbon fiber wrapped barrel NEMO dual chamber compact muzzle brake 6AL-4V Titanium Quick switch .875 journal gas block Suppressed, Unsuppressed settings 4140 IONBOND coating Severe duty threaded stainless gas tube with +2-inch extended length gas system PATENTED recoil reduction carrier 8620 heat treated Nickel Boron coated High pressure bolt 9310 heat treated Cryo'd shot peened MPI Nickel Boron coated Tool steel extractor heat treated IONBOND coated Titanium through drilled takedown and pivot pins Ambidextrous safety selector Ambidextrous charging handle 7075-T6 Mil-Spec forward assist Sling compatible latch plate and properly staked castle nut Geissele Super Dynamic Enhanced (SD-E) two stage trigger First stage 2.3lbs Second 1.2lbs MAGPUL MIAD grip MAGPUL CTR Mil-Spec diameter carbine stock MAGPUL 20 round Gen3 P-MAG Overall length collapsed (38.5 inches) Weight unloaded (8.2 pounds)