Ammunition consistency can play a role in the determination of FRP, however, the close examination of measured pressure and impulse waveforms typically excludes ammunition from the possible factors influencing true FRP, due to the relative consistency of most high quality factory ammunition. This is one of the reasons why The Silencer Sound Standard requires examining multiple sound signature metrics. The FRP phenomenon cannot always be shown by viewing only the peak sound pressure. PEW Science note: First-round sound signatures always differ from subsequent shots, as the atmosphere within the silencer changes. The overall shape of the impulse waveforms measured at the muzzle, from shot-to-shot, are extremely consistent, highlighting the silencer’s overall sound performance consistency at the muzzle after the FRP, as well as the relative consistency of the tested semiautomatic firearm configuration. Figure 4a also shows FRP in the impulse regime. The measured pressure regime first-round-pop (FRP) is evident when comparing Shot 1 (Fig 1) to Shot 2 (Fig 3b). The Obsidian 45 can be obtained from Silencer Shop. The Obsidian 45 can also use the 9mm end-cap from the Obsidian 9 silencer. The silencer is user-serviceable and weighs 12.8 ounces or 10.7 ounces in the long or short configurations, respectively. The main tube is constructed of aluminum. The silencer’s mount section and baffles are constructed of 17-4PH stainless steel. Other mounts are available, including fixed mounts and an internal 3-lug mount module. The silencer mounts to the host firearm with an internal inertial decoupling piston assembly available in multiple standard thread pitches. ![]() The length in the long configuration is 8.6 inches and the length in the short configuration is 6.7 inches. It has a 1.37-inch diameter and is modular, in that it can be configured in the user’s choice of two lengths. It is a 45 caliber centerfire pistol silencer, intended to suppress many cartridges with projectiles appropriately sized to travel through the bore, including. The Obsidian 45 is manufactured by Rugged Suppressors. Rugged Suppressors Obsidian 45 on the HK P30L Full-Size Semiautomatic Pistol
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