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 andwrist, providing a relaxed and better support for the rifle. The 77XS includes a4 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.