Note the delay in normalization of the impulse in Figure 3 with the Omega 9K. PEW Science Research Note 2: Significant silencer over-bore for a given cartridge may manifest similarly across suppressed weapon systems. Subsonic suppression performance is highly dependent upon back pressure generation it is the primary mechanism of subsonic sound signature suppression in most small arm weapon system silencers. PEW Science Research Note 1: The decrease in back pressure with the Omega 9K and its short length compared with that of many dedicated 30 caliber rifle silencers is significant. This is evident in the significantly steeper initial positive phase impulse slopes displayed in Figure 3 during Shot 1 and Shot 2, as well as in the aforementioned significant initial positive phase pressure duration. As discussed above, the Omega 9K generates lower back pressure due to significant over-bore and short length, and therefore is less efficient at trapping gas on this platform and containing ancillary combustion during the first shots. The SilencerCo Omega 9K produces significantly perceptible FRP to bystanders on this platform it is pronounced in both the pressure regime (Figure 2) and the impulse regime (Figure 3). Again, full and short timescales are shown. The real sound impulse (momentum transfer potential) histories from the same 5-shot test are shown in Figure 3. A zoomed-in timescale displays the region of peak sound pressure in Figure 2b, for the first three shots. The primary sound signature pressure histories for all 5 shots are shown in Figure 2a. Although it possesses a high flow rate for the cartridge, the Omega 9K surpasses the subsonic 300 BLK Suppression Performance of the OSS HX-QD 762 (Review 6.45) a silencer with an extremely high flow rate. The significantly higher at-ear Suppression Rating of the SOCOM762-RC2 over that of the Omega 9K is influenced by the silencer’s length and the distance from the endcap orifice to the shooter’s ear. The SOCOM762-RC2 possesses a high flow rate, in accordance with the PEW Science Omega Metric (Public Research Supplement 6.40). It should be noted, however, that the Omega 9K is only 4.6 inches long, yet it approaches the muzzle Suppression Rating of the Surefire SOCOM762-RC2 (Review 6.46) on the same platform. Due to this higher flow rate from significant over-bore, the Omega 9K possesses a significantly lower Suppression Rating with the subsonic 300BLK cartridge than many dedicated 30 caliber silencers on this weapon system. This is in contrast to the behavior of a silencer with significantly restricted flow on the platform, such as the Surefire SOCOM300-SPS (Review 6.57). The 9mm bore in the six baffles of the Omega 9K allows for significant early-time flow (Feature 3 in Figure 1) additionally characterized by a significant early-time positive phase duration until approximately 30.4 ms. The back pressure generated by the SilencerCo Omega 9K is lower than that generated by typical 30 caliber silencers on the 300 BLK platform due to significant over-bore.
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