The Winchester Air Rifle Model 77XS is a multi-pump, dual ammo air rifle that's loaded with great features. You'll like the way the thumbhole fits your hand and wrist, providing a relaxed and better support for the rifle. The 77XS includes a 4 X 32 air rifle scope. You can load single .177 caliber pellets. Or, load up to 50 BBs in the port and every time you pull back the bolt, you can quickly load another BB. With every pump you'll gain power and velocity. Pump the gun three times for indoor target shooting practice. Or pump it up to ten times to achieve maximum velocity - up to 800 feet per second. Features .177 cal. DUAL AMMO BB OR PELLET RIFLE 4 X 32 air rifle scope Rugged, durable, composite stock and forearm Specifications Action: Multi-pump pneumatic Caliber: .177 cal. (4.5 mm) BB or pellet Barrel: Rifled steel Sights: Blade and ramp front/Adjustable rear Stock/Forearm/Grip: Black Synthetic Thumb Hole Stock Safety: Crossbolt trigger block Capacity: 50 shot/BB; Single shot/pellet Max. Muzzle Velocity: 800 fps (BB) Max. Shooting Distance: 291 yds. Overall Length: 37.6" Weight: 3.1 lbs.