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Traditional measures of suppressor noise reduction have focused on the change in the peak sound pressure level between suppressed and unsuppressed conditions. Because of the MIL-STD 1474D, the ability to reduce the suppressed level to below 140 dB peak sound pressure level (dB pSPL) was the goal for firearm suppressor manufacturers.
The decibel rating level is 25dB. The Wind Talker can be mounted to any rifle with either a 7.62 mm or 5.56mm bore diameter as long as it utilizes a Vortex flash hider. The Wind Talker sound suppressor is in the military inventory system as NATO Stock Number: NSN 1005-LLL-997965, utilizing the same NSN number as the M14DC which it replaced. [1] [5]
Firearms fitted with SilencerCo suppressors. Sparrow 22, which is compatible with multiple calibers up to 5.7×28mm and rated for full-auto fire. Warlock 22, a .22 LR silencer that weighs 3.0 oz and reduces sound to 114.6 dB. Spectre 22, which handles a range of ammunition from .22 LR to 5.7×28mm.
In other media, such as underwater, a reference level of 1 μPa is used. [9] These references are defined in ANSI S1.1-2013. [10] The main instrument for measuring sound levels in the environment is the sound level meter. Most sound level meters provide readings in A, C, and Z-weighted decibels and must meet international standards such as IEC ...
The suppressor was the M14SS-1, designed for the M14 rifle, and forty suppressors were sent unofficially to the 9th Infantry Division in Vietnam during early 1969 for combat evaluation, and an undisclosed number were procured under ENSURE Number 360.1, but the suppressor was not adopted officially.
The PBS-1 silencer, designed for use with the AKM to reduce the noise when firing, was introduced in the 1960s, and was used mostly by Spetsnaz forces and the KGB. [3] [4] [5] They were used by the Spetsnaz in the Soviet–Afghan War in the 1980s, requiring the use of the AKM (modernized variant of the AK-47), because the newer AK-74 did not have a silencer available. [6]
Measurements indicate that on a rifle, a muzzle brake adds 5 to 10 dB to the normal noise level perceived by the shooter, increasing total noise levels up to 160 dB(A) ± 3 dB. [20] Painful discomfort occurs at approximately 120 to 125 dB(A), [ 21 ] with some references claiming 133 dB(A) for the threshold of pain.
Subsequent official firing tests recorded the De Lisle produced 85.5 dB of noise when fired. [8] As a comparison, modern testing on a selection of handguns has shown that they produce 156 to 168 dB when firing without a silencer, and 117 to 140 dB when firing with one fitted. [ 9 ]