M4/M16/M249 question.

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How loud is the 5.56mm?

Does anybody here know how loud in dB the M4/M16 and M249 is when it fires. Or any 5.56mm weapon for that matter? Are they as loud as the AK-47?

I never fired a 5.56 weapon before but someone told me once they can be almost as loud as a 7.62X51mm NATO. Is this true, it looks like they are loud but I can't know just by watching movies.:rolleyes:
 
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Aussie Digger

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Does anybody here know how loud in dB the M4/M16 and M249 is when it fires. Or any 5.56mm weapon for that matter? Are they as loud as the AK-47?

I never fired a 5.56 weapon before but someone told me once they can be almost as loud as a 7.62X51mm NATO. Is this true, it looks like they are loud but I can't know just by watching movies.:rolleyes:
They are relatively loud, yes.

I would say there is no audible difference that I was ever able to tell between a rifle firing 5.56x45 to 7.62x39 calibre ammunition.

Automatic rifles do sound different when firing on an automatic setting, but that it rate of fire as much as anything else...

I seriously doubt that many people could tell the difference, by the sound, from a single shot fired individually from an M-16 or an AK-47, if they could not see the weapon that was fired.
 

F-15 Eagle

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They are relatively loud, yes.

I would say there is no audible difference that I was ever able to tell between a rifle firing 5.56x45 to 7.62x39 calibre ammunition.

Automatic rifles do sound different when firing on an automatic setting, but that it rate of fire as much as anything else...

I seriously doubt that many people could tell the difference, by the sound, from a single shot fired individually from an M-16 or an AK-47, if they could not see the weapon that was fired.
They must have the same amount or close to the same amount of gun power then. I have shell casing at my house and they look to have the same gum powder volume just different lengths and widths.

I do know that most 5.56 weapons have muzzle brakes on the end of their barrels well the AK-47 does not which that might have something to do with noise.
 

zrok

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I have fired both an M4/M16 (5.56mm) and the M14 (7.62mm) and they are both pretty loud. There is a difference that I can hear when I fire them. The M4/M16 seems to have a slightly higher pitched sound than the M14. Listening from behind the gun line however I can't really tell the difference between them unless they are fired on automatic.
 

Chino

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When I was a recruit, one of the first demo they showed us at the range was firings of the M16 vs a vintage FN FAL (SAF rifle circa 1960s).

They told us the 2 sounded different. They must've sounded different but I can't remember now what the FN FAL sounded like.

They also demo the penetration power difference at defeating different cover.

But back to the M16...

That thing is loud. I tried not wearing ear plugs once while others were firing a few feet away from me at the open-air range. It was deafening. I quickly stuff the earplugs in.

I wonder what people do in war: Do they wear earplugs? If not you'd definitely lose a lot of your hearing during the firefight.

Can you imagine shooting INSIDE a house? Even a 9mm pistol would be deafening.

Let's no even talk about the bigger calibers. At live firings I try to base myself as far away from the GPMG as possible. The 84 Gustav, mortars etc, even at a distance you can feel the shockwave of their firings. I can't even to begin to imagine what it's like being under bombardment.

I also fired the M203, can't remember the sound, because the kick took my attention more.

Once at the tank training area, a M113 skidded to a halt near us and started hammering away with the 50 cal. It was only blanks, and it was a completely open area. So it wasn't so bad, but it had a deep thump and quite slow ROF. And all the empty shell casings dropping onto the top of the tank.

I love firearms!!!
 

F-15 Eagle

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That thing is loud. I tried not wearing ear plugs once while others were firing a few feet away from me at the open-air range. It was deafening. I quickly stuff the earplugs in.

I wonder what people do in war: Do they wear earplugs? If not you'd definitely lose a lot of your hearing during the firefight.

Can you imagine shooting INSIDE a house? Even a 9mm pistol would be deafening.

Let's no even talk about the bigger calibers. At live firings I try to base myself as far away from the GPMG as possible. The 84 Gustav, mortars etc, even at a distance you can feel the shockwave of their firings. I can't even to begin to imagine what it's like being under bombardment.

I also fired the M203, can't remember the sound, because the kick took my attention more.

Once at the tank training area, a M113 skidded to a halt near us and started hammering away with the 50 cal. It was only blanks, and it was a completely open area. So it wasn't so bad, but it had a deep thump and quite slow ROF. And all the empty shell casings dropping onto the top of the tank.

I love firearms!!!
I don't know what happens in war maybe I think they now have a new ear plug devise where they can still receive orders and talk to other solders but it still protects them from the gunshots although I don't know if they use it or not and I don't know the name of it.

With all the weapons used and how loud they are its no wounder why many get shell shocked.
 

eckherl

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I don't know what happens in war maybe I think they now have a new ear plug devise where they can still receive orders and talk to other solders but it still protects them from the gunshots although I don't know if they use it or not and I don't know the name of it.

With all the weapons used and how loud they are its no wounder why many get shell shocked.
Yes, there is hearing protection used that will muffle out the louder decibles of weapons systems while still giving you the ability to communicate with your fellow soldiers and listening to the battlefield and its surroundings.
 

eckherl

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They must have the same amount or close to the same amount of gun power then. I have shell casing at my house and they look to have the same gum powder volume just different lengths and widths.

I do know that most 5.56 weapons have muzzle brakes on the end of their barrels well the AK-47 does not which that might have something to do with noise.
AK 47s can be equipped with a true muzzle brake device and there is lots of different varieties of them, just depends on which country the rifle is manufactured.
 

sgtgunn

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I don't know what happens in war maybe I think they now have a new ear plug devise where they can still receive orders and talk to other solders but it still protects them from the gunshots although I don't know if they use it or not and I don't know the name of it.

With all the weapons used and how loud they are its no wounder why many get shell shocked.
Theoretically all US forces are expected to wear hearing protection (i.e. earplugs) "outside the wire". In reality it depends on the person, the mission and the immediate chain-of-command. If I remembered, I would wear one earplug on my "firing" side, but often times didn't bother. We had a sort of "earbud" for our radios that provided some limited hearing protection for our left ears. The bottom line? Hearing loss is one of the major disability claims for US soldiers who have been in combat. Vehicle crews with CVC helmets have it better, since the helmet's ear "muffs" act as hearing protection.

Based on personal observation 7.62mm N is louder than 5.56mm N, but not by what I would consider a significant amount. It becomes more apparent in high volume fire i.e. M240B vs. M249. The .50 is very loud. M203 isn't too bad - it makes a sort of "hollow" thunking noise. The AT-4 is VERY, VERY loud, painfully so. I've heard that the USMC's SMAW is even worse, but I haven't personally heard one fire.

Firing in an enclosed space (i.e. CQB) makes the noise much worse - 5.56mm gets very uncomfortably loud, though honestly with the adrenaline going you really don't ntoice it all that much at the time.

Adrian
 

F-15 Eagle

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Theoretically all US forces are expected to wear hearing protection (i.e. earplugs) "outside the wire". In reality it depends on the person, the mission and the immediate chain-of-command. If I remembered, I would wear one earplug on my "firing" side, but often times didn't bother. We had a sort of "earbud" for our radios that provided some limited hearing protection for our left ears. The bottom line? Hearing loss is one of the major disability claims for US soldiers who have been in combat. Vehicle crews with CVC helmets have it better, since the helmet's ear "muffs" act as hearing protection.

Based on personal observation 7.62mm N is louder than 5.56mm N, but not by what I would consider a significant amount. It becomes more apparent in high volume fire i.e. M240B vs. M249. The .50 is very loud. M203 isn't too bad - it makes a sort of "hollow" thunking noise. The AT-4 is VERY, VERY loud, painfully so. I've heard that the USMC's SMAW is even worse, but I haven't personally heard one fire.

Firing in an enclosed space (i.e. CQB) makes the noise much worse - 5.56mm gets very uncomfortably loud, though honestly with the adrenaline going you really don't ntoice it all that much at the time.

Adrian
When you say 7.62mm N, are you talking about the 7.62X51 NATO?
 

F-15 Eagle

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I did some poking around online and found this:

http://books.nap.edu/openbook.php?record_id=11443&page=81

I was wrong. Apparently 5.56x45mm NATO is actually louder than 7.62x51mm NATO. Maybe due to higher MV?

M16 @ 157 db
M249 @ 160 db
M60 @ 150 db

Even more surprising the M2 .50 cal is only 153 db - less noise than an M16!

Adrian
I'm pretty sure that noise is based off of the gun powder explosion and not the MV, but that might be a factor I'm no expert.

I don't see the 5.56 louder than a .50 cal it does not seam possible. I know the 5.56 can be almost as or as loud as the 7.62, but louder than a .50 cal? I don't know about that. Than it says a 105mm gun is louder than a 155mm gun. How is that possible?
 

old faithful

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The shorter the barrel, the louder the bang. SLRs sound different to an M16 which sounds different to an AK...they are all loud, but have distictive sounds.
 

Wooki

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The shorter the barrel, the louder the bang. SLRs sound different to an M16 which sounds different to an AK...they are all loud, but have distictive sounds.
Thinking back on it, the only difference I ever noted was when the thing whizzes pass your head, especially after a ricochet. Bigger the bullet, bigger the whizz wherr sound (and no, it is not combat experience, It is living amongst really bad deer hunters:rolleyes:)

cheers

w
 

Chino

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Thinking back on it, the only difference I ever noted was when the thing whizzes pass your head, especially after a ricochet. Bigger the bullet, bigger the whizz wherr sound (and no, it is not combat experience, It is living amongst really bad deer hunters:rolleyes:)

cheers

w
I have never experienced a "whizz".

...

I have never been shot at but we did, however, had to do "butt party" in the old days before our rifle ranges became fully automated.

We stood inside a channel below ground level at the butt of the range and lifted up targets for 4 seconds exposures before lowering them. After that we also tally the number of holes before taping them up for the next sequence.

When 5.56 passes overhead, the sound we heard was a loud "PIAK" - like the sharp crack of a thin whip.

At 300m down-range, we hear the crack a few milli-seconds before we hear the "boom" of the firing because the speed of sound is slower than the supersonic bullet.

So a detail of 12 people firing from 300m away would sound like many whips cracking, quickly followed by the "booms"

When I was a kid I read comics where some writers put the word "crack" to add a dimension of sound to gunfight scenes. Back then I was wondering why cos in the movies the guns went "boom", not "crack".

...

Most war movies never reproduce this sound when recreating a scene of being under fire. Maybe it is because most movie makers don't know that a supersonic bullet makes this sound when passing overhead. Or maybe they know, but the general audience doesn't, and would find this sound confusing or unbelievable.
 

eckherl

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I'm pretty sure that noise is based off of the gun powder explosion and not the MV, but that might be a factor I'm no expert.

I don't see the 5.56 louder than a .50 cal it does not seam possible. I know the 5.56 can be almost as or as loud as the 7.62, but louder than a .50 cal? I don't know about that. Than it says a 105mm gun is louder than a 155mm gun. How is that possible?
The reason why a 105mm seems louder (I am assuming that you are talking about a tank maingun) versus a 155mm howitzer is due for two reasons, one is due to propellants for tank ammunition (flatter tragectory), the other reason is due inpart because a howitzer more than likely is pointed skyward when launching a round causing a shift in noise decibles. You would not want to be near a 155mm firing in the point blank mode, the concussion does have the capability to cause extreme medical complications to your body if you are not behind it.

Also, a weapon with a muzzle brake will always be louder versus a weapon without one, thus the reason why they are not used on tank mainguns.
 

eckherl

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I have never experienced a "whizz".

...

I have never been shot at but we did, however, had to do "butt party" in the old days before our rifle ranges became fully automated.

We stood inside a channel below ground level at the butt of the range and lifted up targets for 4 seconds exposures before lowering them. After that we also tally the number of holes before taping them up for the next sequence.

When 5.56 passes overhead, the sound we heard was a loud "PIAK" - like the sharp crack of a thin whip.

At 300m down-range, we hear the crack a few milli-seconds before we hear the "boom" of the firing because the speed of sound is slower than the supersonic bullet.

So a detail of 12 people firing from 300m away would sound like many whips cracking, quickly followed by the "booms"

When I was a kid I read comics where some writers put the word "crack" to add a dimension of sound to gunfight scenes. Back then I was wondering why cos in the movies the guns went "boom", not "crack".

...

Most war movies never reproduce this sound when recreating a scene of being under fire. Maybe it is because most movie makers don't know that a supersonic bullet makes this sound when passing overhead. Or maybe they know, but the general audience doesn't, and would find this sound confusing or unbelievable.
I have heard a few whizzes and some that have sounded like a oversized bumble bee flying by, but hearing the high pitched cracks is a bad bad thing, more than likely means that they could have a bead on you.:shudder
 

Wooki

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I have never experienced a "whizz".

...
.
The Whizz Wherr is produced when the bullet tumbles. For those who don't appreciate leaving things to lady luck, it is very disconcerting. Because at some sort of base level, you realize it is random.

cheers

w
 

eckherl

The Bunker Group
Verified Defense Pro
Thinking back on it, the only difference I ever noted was when the thing whizzes pass your head, especially after a ricochet. Bigger the bullet, bigger the whizz wherr sound (and no, it is not combat experience, It is living amongst really bad deer hunters:rolleyes:)

cheers

w
Oh Oh,

Not the annual beer hunting party for the majority of hunters out there.:eek:nfloorl:

Thus the reason why I stay out of the woods around this time of year, plus I have the attendancy to shoot back when I am being shot at, after I explained this to my brothers and uncles they seem to not want to invite me along, so much for family.:(
 
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