![]() ![]() ![]() The PVAR design prevents hot and high-pressured gases from reaching the bolt assembly and the chamber. The patented PVAR or Pneumatic Valve and Rod System are a “bare-bones, no-frills and very simple” designed gas and piston operating system that utilizes a combination of gas and mechanical energy for more effective and reliable cycling of the weapon. The DGIS has a simpler design between the two as it has fewer parts and uses the hot gases coming from the gas port of the barrel and through a gas tube, the hot gases are rammed into the bolt carrier group to cycle the round. The S7 uses two action designs, the Direct Gas Impingement System (DGIS) and the patented Pneumatic Valve and Rod System (PVAR). The S7 takes after the M110 battle rifle designed by Eugene Stoner. United Defense Mfg Corp’s S7-PVAR and S7-DGIS are variants of the M110-SASS, Semi-Automatic Sniper System precision rifles chambered in the time-tested 7.62 NATO round (7.62 x 51mm) and designed to hit point targets up to 1,000 meters (MER).
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