As Griffin Armament continuously refines and improves its designs and develops new technology, it has been very good about applying these improvements not only to its new products, but to its existing product line. One example is the Recce 5, which has been a solid choice among dedicated 5.56 suppressors for nearly a decade and is now in its fourth generation, aka the Recce 5 MOD 4.
Thanks to Silencer Shop we were able to borrow a Recce 5 MOD 4 and put it through its paces on the range. Check it out by hitting play on the video embedded above or click HERE to view it over on Rumble.
Summary: the MOD 4 flavor of the Recce 5 brings a touch of additional sound suppression performance to the table along with a meaningful reduction in backpressure thanks to Griffin’s new “ECO-FLOW” baffle design. My personal opinion on the suppressor is that it’s a solidly-made, durable 5.56/.223 (up to .22-250) silencer that performs slightly better than the market average at about your typical 5.56 silencer size and maybe slightly heavier than average weight. It’s a good value for the price, especially with Griffin’s very strong warranty protection.
Specifications: Griffin Armament Recce 5 MOD 4
Caliber Ratings: .223/5.56 up to .22-250
Barrel Length Restrictions: none
Full Auto Rated: Yes
Diameter: 1.47 inches
Overall Length: 6.2 inches
Weight: 14.5 ounces
Materials: 17-4 PH stainless steel
Finish: high temp Cerakote
dB Attenuation: 35 dB on 14.5-inch 5.56
MSRP: $695 (available through Silencer Shop for approximately $110 less)
What’s he aiming with?
dominant eye.
we don’t need no steenking sights.
don’t need to aim just to demo the suppressor.
I saw the paycheck which was of $9282, I didn’t believe that my mom in-law was like truly enring money part time from their computer.. there neighbor started doing this 4 only 21 months and recently paid for the on their home and got Maserati.
more info here……………….>>>> http://Www.Works16.com
manufacturer/brand name of the 5.56/.223 ammo being used?
Probably Wolf Gold or Armscor. Whatever I had handy. It’ll be normal, full velocity, 55 grain .223 though.
In general a 16 inch AR-15 firing standard M193 produces a decibel level of around ~167 dB give or take depending on environmental conditions. This suppressor specs say “Sound reduction: 35 dB”
@35dB gives a reduction factor of -5.83 dB. Every -6 dB is a 50 % reduction in SPL so -5.83 dB is about 6 dB and the difference between 5.83 and 6 is negligible for SPL — so ~167 dB / ~2 which means an effective average SPL ~ 83.5 dB for the suppressor and that’s not too shabby.
For an adult, a continuous, or frequent, noise level of ~85 dB (+/- 5 dB, varies with person) will result in hearing damage and either cause permanent or temporary hearing loss. Even if not frequent or continuous but repeated over time can still cause permanent hearing damage very slowly that may take years to notice but one day they will. The closer you are to the noise source the more likely hearing damage becomes.
I’m glad to see you wearing hearing protection Jeremy even if it does sound quiet.
“In general a 16 inch AR-15 firing standard M193 produces a decibel level of around ~167 dB give or take depending on environmental conditions. ”
should have been … “In general a 16 inch AR-15 firing standard M193 produces a decibel level (SPL) of around ~167 dB give or take depending on environmental conditions.”
No, you’re overthinking this. A 35 dB reduction as meant by Griffin, which is how that phraseology is meant by all suppressor manufacturers, would mean going from your estimated 167 dB down to 132 dB. They’re speaking of a raw number reduction. 132 dB would be on the impressively quiet end of the spectrum for a suppressed 5.56 as measured at one meter left of the muzzle.
OSHA (and the military, etc) considers gunshot noises to be impulse noises and they set the max threshold for “hearing safe” at 140 dB. The truth is, yes, that it’s cumulative so subjecting yourself to lots of these impulses, even if under 140 dB, will cause incremental hearing damage. Pew Science has been doing great work with the creation of a new silencer sound safety standard that takes amount of exposure into account.
No, i’m not overthinking it. You don’t understand the way SPL works. And there’s that 140dB thing again. Ok, you want to do OSHA so lets do OSHA.
“which is how that phraseology is meant by all suppressor manufacturers”
No, it isn’t. It depends on how the measurement took place – with RMS processing or not in the measurement device. I happen to know that Griffin uses measurement devices with RMS processing which measures SPL, its why I commented.
SPL = Sound Pressure Level = Sound Pressure (Pa)= Sound Pressure is the sound force (N) acting on the surface area (m2) perpendicular to the direction of the sound. SPL is what affects hearing. (note: m2 is suppose to be m squared – can’t do superscript here). SPL is a sound energy force, in short a “power” (which, for example, is why speakers are rated in “watts”) and the factor for power is 6dB = 50%.
~85 dB (+/- 5 dB) is the ANSI level upon with the OSHA 90dBA level is set. 90dBA is 85 dB SPL. (the 90dBA will enter this a little further down)
The 167 dB is derived from a figure provided by the government where the measurement was SPL.
You can’t do a simple 167 – 132 calculation for SPL. Sound is not a linear function, its logarithmic.
“They’re speaking of a raw number reduction.”
No, they aren’t. They are speaking of their measurement and the measurement is not a raw number.
“… gunshot noises to be impulse noises …”
I’m well aware of what impulse noise is, and I’m well aware that gunshot is impulse noise.
“OSHA (and the military, etc) considers gunshot noises to be impulse noises and they set the max threshold for “hearing safe” at 140 dB.”
No. You have some things mixed up.
OSHA maximum exposure level is max 90 dB (85dBA) in an 8 hour period, its the Permissible Exposure Limit (PEL) and the military and all of government and industry uses it uses it too only the military has a standing waiver to ignore the limit.
140 dB defines the OSHA pain threshold, not that it is safe – it is based upon the silent study room as opposed to 20 dB. Your ear within a few feet of a firing weapon is not “silent study room” where the exposure is measured at 6 feet.
The reasoning for the military ignoring the limit by operational waiver is that the nature of the job requires exposure to noise levels at times for which the conditions can not be controlled to lower the noise limit, weapons fire is one of these. So in effect exposure to weapons fire in the military is considered “operationally hearing safe” not actual hearing “safe”, at the OSHA pain threshold. If 140 dB were actually hearing safe the VA would not be paying millions of veterans for damaged hearing for exposure to noise levels below 140 dB.
https://www.osha.gov/laws-regs/standardinterpretations/1991-04-01
“The OSHA limit for impulsive or impact noise is also 140 dB peak sound pressure level” (note: this is SPL)
https://www.safetybydesigninc.com/hearing-protection-safety-tips-noise-ears/#:~:text=In%20a%20working%20day%20with%208%20hours%20on,recommends%2085%20dB%20as%20the%20optimal%20noise%20standard.
“OSHA’s noise standard compels employers to set limits on noise exposure. In a working day with 8 hours on average – 90 dB is OSHA’s legally recommended Permissible Exposure Limit (PEL). Similarly, for a silent study room, it is 20 dB, and 140 dB defines the pain threshold.”
The National Institute for Occupational Safety and Health (NIOSH) actually, sets the recommended ‘safe’ limit lower to below 85dBA > https://www.cdc.gov/niosh/topics/noise/preventhearingloss/default.html
https://www.osha.gov/laws-regs/standardinterpretations/2001-09-26#:~:text=For%20hearing%20conservation%2C%20the%20level%20was%20set%20at,a%20working%20lifetime%20will%20incur%20noise-induced%20hearing%20loss.
official OSHA response dated September 26, 2001 – to Mr. Russell Umbraco
CALICO Lab Manager
California Department of Industrial Relations
Division of Occupational Safety and Health
1555 Doolittle Drive, Suite 140
San Leandro, CA 94577
“Federal OSHA uses the 80 dBA threshold to determine compliance with the hearing conservation provisions, and the 90 dBA threshold to determine compliance with the permissible exposure level (PEL).”
Gee whiz, I do physics for a living, I specialize in the physics of energy and that includes sound energy. Seriously, if you are going to sell suppressors you need to know what you are dealing with and stop giving life to myths.
@35dB gives a reduction factor of -5.83 dB. Every -6 dB is a 50 % reduction in SPL so -5.83 dB is about 6 dB and the difference between 5.83 and 6 is negligible for SPL — so ~167 dB / ~2 which means an effective average SPL ~ 83.5 dB for the suppressor and that’s not too shabby – period.
To add a note: Sound pressure level (SPL) is what does the damage to hearing, not how loud the sound is/was perceived to be.
SPL is actually measured in Pascals (Pa), its converted to dB by measurement devices by RMS (Root Mean Square) measurement conversion. SPL is always measured compared to something else, for example, compared to a 60 dB sound 63 dB has 2 times the SPL even though the sound is only 60 dB but compared to a 60 dB sound 70 dB sounds 2x as loud (perceived).
Good lord 😆 I feel sorry for you
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