![]() ![]() When over-bored silencers are used on weapon systems, such as the Sandman-S on the 5.56x45mm MK18, relative flow restriction can change. As stated, the Omega Metric correlates with flow restriction for a given cartridge. The propensity for the Sandman-S to exhibit relatively high flow rate or low back pressure with the 7.62x51mm NATO cartridge was highlighted upon the examination of its Omega Metric ( Omega_762, Public Research Supplement 6.40). 308 bolt-action rifle in Sound Signature Review 6.11. The Dead Air Sandman-S is a 30 caliber rifle silencer and was previously evaluated on a. In Figure 2b, a shorter timescale is shown comparing the impulse of Shots 1 through 4. The real sound impulse (momentum transfer potential) histories from the same 6-shot test are shown in Figure 2a. The sound signatures of Shot 1 and Shot 2 are shown in Figure 1b, in early time. ![]() The primary sound signature pressure histories for all 6 shots with the Sandman-S are shown in Figure 1a. For more information, please consult the Silencer Sound Standard. PEW-SOFT data is acquired by PEW Science independent testing the industry leader in silencer sound research. The peaks, shape, and time phasing (when the peaks occur in relation to absolute time and to each other) of these raw waveforms are the most accurate of any firearm silencer testing publicly available. The data acquisition rate used in all PEW Science testing is 1.0 MS/s (1 MHz). The waveforms are not averaged, decimated, or filtered. The signatures of Shot 6 are displayed in the data presentation but are not included in the analysis to maintain consistency with the overall PEW Science dataset and bolt-closing signatures. Only five shots are considered in the analysis. Six cartridges were loaded into the magazine, the fire control group positioned to single-shot, and the weapon was fired until the magazine was empty and the bolt locked back on the follower of the empty magazine. Real sound pressure histories from a 6-shot test acquired with PEW-SOFT™ are shown below. Note that PEW Science Member Research Supplement 6.9 3 contains an analysis of the Dead Air Sandman-S using the 5.56 mm end cap on the MK18 and compares its performance using the standard 30 caliber endcap. Section 6.92.3 contains the review summary and PEW Science subjective opinions. Section 6.92.2 contains Suppression Rating comparisons of the Sandman-S with dedicated 223 and 30 caliber silencers on the current market, including the HUXWRX FLOW 556k, Energetic Armament ARX, KAC QDSS-NT4, Rugged Razor556, Otter Creek Labs Polonium, Surefire SOCOM556-RC2, HUXWRX HX-QD 556 and HX-QD 556k, Q Trash Panda, CGS Helios QD, SilencerCo Saker 556, Rugged Razor762, and others. Section 6.92.1 contains the Sandman-S test results and analysis. The standard PEW Science MK18 test host weapon system is described in Public Research Supplement 6.51. Federal XM193 55gr ammunition was used in the test. This Sound Signature Review contains single-test results using the Dead Air Sandman-S with the 3-prong KeyMo flash hider mount on the MK18 Automatic AR15 rifle, chambered in 5.56x45mm NATO with a 10.3-inch barrel. ![]()
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