Beeman QB Chief PCP Air Rifle PCP Bolt-action Single-shot Manual safety 2-stage adjustable trigger Hardwood Stock Fiber-optic front and rear sights 11mm dovetail Rifled barrel 2,000 psi fill pressure 136cc cylinder Up to 50 shots per fill in .177 / 35 shots in .22 caliber 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) Tech Tip: When mounting a scope with a 40mm objective lens or larger, it may be necessary to remove the rear sight.