![]() ![]() Typically, this phenomenon occurs nested with the post-endcap bullet exit event due to flow restriction in silencers trapping this lower pressure volumetric flow in a subsonic flow field. Visibility of plainly decoupled precursor flow (the pressure measured from compression and subsequent overpressure pulse through the air column in the gun barrel by the bullet prior to bullet exit) is rarely seen in the sound signature of a suppressed small arm weapon system. As always, internal silencer design can significantly influence the measured timing and pressure amplitudes. This is a highly unusual sequence observed when firing subsonic 300 BLK ammunition from a bolt-action weapon system with an attached silencer the precursor flow being plainly visible prior to muzzle blast is a phenomenon resulting from the extremely high flow rate of the OSS technology. The maximum peak pressure amplitude of the first shot the primary muzzle blast flow coupled with the bullet endcap exit event, is measured to be 155.8 dB. Prior to muzzle blast exit, peak precursor flow is measured to reach a peak of 134.9 dB. There are four significant events shown:ĭuring combustion within the weapon system, a 121.1 dB peak is measured.Īs the precursor flow exits the silencer’s endcap vent array, a peak of 128.6 dB is measured. Figure 1 shows a 2-millisecond long sequence of events during the first test shot with the OSS HX-QD 762, as measured 1.0 m left of the muzzle. ![]()
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