Furthermore, the differing internal jet expansion timing, facilitated by the removal of baffle 3 and repositioning of baffle 2, induces a distinct difference in primary muzzle blast impulse accumulation. PEW Science postulates this to be a direct result of jet nozzle orifice shape and recess (endcap features). PEW Science Research Note 1: Note the less severe early time rarefaction following the primary muzzle blast with the Razor556 (Fig 1b) than with the Razor762 ( Fig. The above two factors result in both differing internal muzzle blast jet expansion and external muzzle blast jet propagation, when using the Razor556 instead of the Razor762 on the MK18. Razor556 endcap orifice geometry (jet nozzle recess and exterior nozzle chamfer).īaffle quantity and spacing (the Razor556 possesses three baffles, in contrast to the four in the Razor762). The consistent rise time and jet delay present in the Razor556 signatures is postulated to be the result of two primary factors: Like the Razor762, the Razor556 produces a coupled bullet shock and muzzle blast jet event in early time, which is a consequence of the over-bore present in each silencer for the 5.56x45mm NATO cartridge. One of the most significant differences is the delayed shock rise from the Razor556 on the MK18 (Fig 1b). Immediate differences in the the pressure and impulse waveforms shown in Figure 1 and Figure 2, respectively, are noted when compared to those from the Rugged Razor762 in Review 6.58. In Figure 2b, a shorter timescale is shown comparing the impulse of Shot 1 to that of Shot 2 and Shot 3. The real sound impulse (momentum transfer potential) histories from the same 5-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 Razor556 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 6.77 contains comparative analysis of the performance of the Razor556, the Razor762 with its standard 30 caliber endcap, and the Razor762 using the 5.56 mm endcap on the MK18. Section 6.76.3 contains the review summary and PEW Science subjective opinions. Section 6.76.2 contains contains Suppression Rating comparisons of the Razor556 with dedicated 223 and 30 caliber silencers on the current market, including the Otter Creek Labs Polonium, Surefire SOCOM556-RC2, HUXWRX HX-QD 556, Q Trash Panda, CGS Helios QD, SilencerCo Saker 556, Rugged Razor762, and others. The Razor556 is not the same silencer as the Razor762, in construction, features, or performance. Section 6.76.1 contains the Razor556 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 Rugged Razor556 with the M2 muzzle brake mount on the MK18 Automatic AR15 rifle, chambered in 5.56x45mm NATO with a 10.3-inch barrel.
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