Benjamin Marauder air rifle - aka Synrod 10-shot repeater with auto-indexing feature (.25 cal is an 8-shot repeater) Uses compressed air: 2,000 to 3,000 psi (make adjustments as shown in the owner's manual) Can be adjusted for different velocities Internal shroud makes this a VERY quiet gun Choked barrel delivers superior accuracy 2-stage adjustable match trigger...and the trigger is metal! Raised aluminum breech for easier loading of circular magazine 11mm dovetail (does not come with sights) Ambidextrous synthetic stock with vertically adjustable comb (almost a full pound lighter than the wood-stocked rifle!) Reversible bolt -- switch from right to left side (with our special service) Built-in air pressure gauge (manometer) 215cc air reservoir 7.30 lbs.* - is the gun only weight 42.8 long* Includes CenterPoint LR416AORG2 4-16x40mm Rifle Scope with Illuminated Parallax Adjustable T.A.G. Reticle, sling, one magazine and sling swivel studs Upgrades from the original version of the gun: Factory-installed depinger changes the sharp ping to a dull thud. Improved valve (increases the number of shots: .177/.22=32 shots, .25=16 shots). Trigger moved back for better hand position. Optional reversible bolt for left- or right-handed shooters. Simplified breech design for assembly, service and to provide a more stable platform for larger scopes. As the caliber increases, the gun becomes somewhat louder.