POTD: Reducing Noise Pollution – Suppressed M27 Infantry Automatic Rifle

Eric B
by Eric B
(U.S. Marine Corps photo by Lance Cpl. Hunter J. Jones)

If TFB’s Photo Of The Day came with sound you couldn’t hear this post. The subject today is suppressed M27 Infantry Automatic Rifles. Above you see U.S. Marine Corps Cpl. Antonio Keifner, a rifleman with Bravo Company, 3rd Littoral Combat Team, 3rd Marine Littoral Regiment, 3rd Marine Division, as he fires a suppressed M27 Infantry Automatic Rifle during a range acoustic test at Pu’uloa Range Training Facility, Marine Corps Base Hawaii. The MCBH’s Safety Department and PRTF personnel were there to conduct an acoustic test, to record and determine the effectiveness of suppressed weapons at reducing noise pollution exiting PRTF.

A U.S. Marine fires a suppressed M27 Infantry Automatic Rifle (U.S. Marine Corps photo by Lance Cpl. Hunter J. Jones)
Marine Corps Base Hawaii Safety Department personnel and Chief Warrant Officer 2 Christopher Simser Jr., MCBH Gunner, examine sound-level data.
U.S. Marine Corps Base Hawaii Safety Department personnel assemble a sound meter to record decibel-level data.
U.S. Marine Corps Base Hawaii Safety Department personnel assemble a sound meter.
Marine Corps Base Hawaii Safety Department personnel discuss sound-level data.
Marine Corps Base Hawaii Safety Department personnel monitor a sound meter collecting decibel-level data.
U.S. Marines fire suppressed M27 Infantry Automatic Rifles.
A sound meter detects and captures decibel-level data from an unsuppressed rifle.
(U.S. Marine Corps photo by Lance Cpl. Hunter J. Jones)
A U.S. Marine fires a suppressed M27 Infantry Automatic Rifle during a range acoustic test at Pu'uloa Range Training Facility, Marine Corps Base Hawaii, Sept. 19, 2023. MCBH's Safety Department and PRTF personnel conducted the acoustic test to record and determine the effectiveness of suppressed weapons at reducing noise pollution exiting PRTF. (U.S. Marine Corps photo by Lance Cpl. Hunter J. Jones)
A U.S. Marine fires a suppressed M27 Infantry Automatic Rifle.
U.S. Marine Corps Cpl. Antonio Keifner, a rifleman with Bravo Company, 3rd Littoral Combat Team, 3rd Marine Littoral Regiment, 3rd Marine Division, fires a suppressed M27 Infantry Automatic Rifle.

Source: U.S. Marine Corps, photo by Lance Cpl. Hunter J. Jones.

Eric B
Eric B

Ex-Arctic Ranger. Competitive practical shooter and hunter with a European focus. Always ready to increase my collection of modern semi-automatics, optics, thermals and suppressors. TCCC Certified. Occasionaly seen in a 6x6 Bug Out Vehicle, always with a big smile.

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  • Romeohoteleng Romeohoteleng on Oct 19, 2023

    Lol I used that sound meter while developing my suppressor for the DP-12 Shotgun. It has an inadequate sample rate for determining true peak sound pressure levels, never mind identifying the realistic hearing damage potential.

    • Lee Lee on Oct 19, 2023

      @romeohoteleng They were not their to test the hearing damage potential of necessarily peak db. They were there to test for noise pollution so also as the suppressor reduce the sound of the gun shot enough they are good.

  • Social_Artifice Social_Artifice on Oct 20, 2023

    The HK ar series or guns are the coolest dumbest guns out there right now.

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