Benjamin Marauder air rifle 10-shot repeater with auto-indexing feature 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 grooves (use only 2-piece scope mounts) Hardwood stock with adjustable comb and checkered grip & forearm (stock stain may be lighter or darker than shown in our images) Built-in air pressure gauge (manometer) 215cc air reservoir 42.8" long* 8.2 lbs.* Air reservoir ends with a male quick-disconnect Foster fitting for fast refills (requires a female Foster quick-disconnect adapter to fill from a scuba tank or hand pump) Includes one magazine, sling swivel studs & degassing tool (to quickly remove air from reservoir) 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. Reversible bolt for left- or right-handed shooters.** Simplified the breech design for assembly, service and to provide a more stable platform for larger scopes.As the caliber increases, the gun becomes somewhat louder.