AirForce Tex-Rex Carbine Big Bore Air Rifle Available in .457 and .510 calibers Velocity: Up to 1090 FPS in .457 and 800 FPS in .510 Max Fill Pressure: 4500 psi/310 bar Muzzle energy: up to 900 FPE New Titanium Valve System 500cc carbon-fiber air tank Two-stage, position-adjustable trigger Safety: Manual 24.75" Lothar Walther barrel Single shot Shots per fill vary based on Bias Port Weight: 6.95 lbs Length: 39" Weaver/ Picatinny rail M-LOK Foregrip Made in the USA Please Note: Before 2026 this gun came with an 11mm dovetail scope rail. It now comes with a Weaver/Picatinny scope rail.