The new Proto SLG™ includes patented Spool Valve Technology, which allows the gun to operate more consistently at a lower operating pressure, giving you 1500 shots on a 68/4500-air tank. In addition, the new multifunction, self-lubricating Force Button allows clearing the bolt without tools, acts as a cocking mechanism, and prevents unsafe disassembly of the marker when gassed up. The SLG™ comes standard with the new Hyper3™ In-Line Air Regulator featuring higher flow, more consistency, and smoother velocity adjustment. Regular maintenance and cleaning are easy with one-tool-one-screw bolt breakdown. The Proto SLG™ consists of solid construction using a hardened steel sear, aluminum body and bolt, and a reinforced polymer frame and trigger. All this adds up to a tournament grade package you can afford.