Xtra Pro Pack Description Performance Features + Xtra Marker + Avant Goggles + 12oz. CO2 Tank + Hopper + BBD & Spare Parts Kit Performance Features Xtra Features + All New Clamping Collar Feedneck + Hard Anodized Matte Finish + Reduced Overall Profile (15% Lighter and 10% Shorter) + All Aluminum Construction + Standard CA Thread Foregrip Expansion Chamber and Vertical Adapter + Pull Pin Top Cocking Delrin Bolt + 10” Micro Ported Barrel + Tool-Free Striker Plug Design + Ergonomically Designed Aluminum Trigger Frame + No-Slip Rubber Grip Panel + Two Finger Trigger + External Velocity Adjuster + Steel Braided Hose Line + Inline Bottom-line ASA + Operates on CO2 or Compressed Air Avant Goggle System + Twist-Lock Retention System (Simple Lens Installation) + Un-Obstructed Field of Vision + Dual Density Foam for a Secure Fit + Quick Change Strap Anchor + Soft Flexible Face Mask + Removable Visor + Superior Ventilation