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Posted: 4/18/2017 1:10:22 PM EDT
[#1]
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Posted: 4/18/2017 1:11:28 PM EDT
[#2]
You serious?
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Posted: 4/18/2017 1:12:34 PM EDT
[#3]
Yes
yes and see above. It it takes more than 200 rounds at cyclic rate to damage the barrel. When in doubt, go cyclic! |
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Posted: 4/18/2017 1:12:44 PM EDT
[#4]
It gets very cold when firing and it will form ice that bends the barrel.
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Posted: 4/18/2017 1:13:07 PM EDT
[#5]
You've been here 16 years. 16.
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Posted: 4/18/2017 1:13:20 PM EDT
[#6]
Quote HistoryQuoted:
It gets very cold when firing and it will form ice that bends the barrel. |
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Posted: 4/18/2017 1:13:32 PM EDT
[#7]
Quote HistoryQuoted:
It gets very cold when firing and it will form ice that bends the barrel. |
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Posted: 4/18/2017 1:14:16 PM EDT
[#8]
And then the front just drops the fuck off!
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Posted: 4/18/2017 1:14:16 PM EDT
[#9]
The hotter the barrel the more damage it takes from the rounds going down, once the rifling is worn away it is 'shot out', the diameter of the barrel being larger than the diameter of the projectile. Every 120 rounds is excessive, I believe that it is not round count dependent. More along the lines of how fast you have been running the gun. Nobody is going to stop in the middle of the belt to change barrels, anyway. 200rds on a belt as I recall, plus or minus.
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Posted: 4/18/2017 1:14:52 PM EDT
[#10]
Quote HistoryQuoted:
Thus the insulated gloves in the barrel bag. Prevents frostbite. 
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Posted: 4/18/2017 1:15:32 PM EDT
[#11]
Quoted:
I was watching a video of a guy shooting a MG-42 machine gun and he was saying how the gunner must shoot short burst and change/rotate the barrel every 120 rounds (I think he said 120 rounds) or so to prevent barrels from getting "shot out". I must be doing it wrong. |
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Posted: 4/18/2017 1:16:08 PM EDT
[#12]
I saw an 11Bush shoot out the rifling of a M-2 at Baumholder. He had linked several belts together and held down the butterfly. The barrel got so hot that towards the end you could see the bullets moving down the barrel. When they came out, they sort of wobbled down range. In addition to whatever other punishment he got, his Plt. Sgt. made him walk ~15miles back to garrison carrying that red (by then) hot barrel.
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Posted: 4/18/2017 1:17:01 PM EDT
[#13]
We need more water cooled machine gun pics in this thread.
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Posted: 4/18/2017 1:20:07 PM EDT
[#14]
Quote HistoryQuoted:
It gets very cold when firing and it will form ice that bends the barrel. Yeah! Science bitch! Actually, as the barrel heats up, condesation takes place. This raises chamber pressure and forces water molecules into the steel. Accelerated rusting takes place and the barrel eats itself. First discovered by JMB, its called the Browning effect although Maxim claims to have seen it first. Using a glove was first recommended by PFC Homer Knutson who is famously quoted as saying, "Fuck that's hot!" |
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Posted: 4/18/2017 1:21:44 PM EDT
[#15]
Because the hotter the barrel is, the softer the barrel steel becomes.
Firing at the cyclic rate on a very hot barrel is going to erode more of the throat, per shot, than firing the same number of rounds at the same rate through a cooler barrel. |
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Posted: 4/18/2017 1:22:13 PM EDT
[#16]
Well... the MG42 is an old machine gun and back then the Germans added a high chocolate content to the chemical make-up of the steel and, well, you know what happens to a chocolate bar when you keep it in your pocket too long...
Recent advancements in candy coating technology protects the chocolate in the steel from melting away under the heat produced by longer sustained rates of fire... so it's not as much of a concern now. |
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Posted: 4/18/2017 1:23:29 PM EDT
[#17]
In before "not sure if serious" meme....
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Posted: 4/18/2017 1:24:23 PM EDT
[#18]
Quote HistoryQuoted:
Yeah! Science bitch! Actually, as the barrel heats up, condesation takes place. This raises chamber pressure and forces water molecules into the steel. Accelerated rusting takes place and the barrel eats itself. First discovered by JMB, its called the Browning effect although Maxim claims to have seen it first. Using a glove was first recommended by PFC Homer Knutson who is famously quoted as saying, "Fuck that's hot!" |
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Posted: 4/18/2017 1:25:11 PM EDT
[#19]
01ers.
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Posted: 4/18/2017 1:25:57 PM EDT
[#20]
Quote HistoryQuoted:
This is how 9/11 happened. TRUTHER! |
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Posted: 4/18/2017 1:26:22 PM EDT
[#21]
Piss on it!
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Posted: 4/18/2017 1:27:21 PM EDT
[#22]
Quote HistoryQuoted:
Well... the MG42 is an old machine gun and back then the Germans added a high chocolate content to the chemical make-up of the steel and, well, you know what happens to a chocolate bar when you keep it in your pocket too long... Recent advancements in candy coating technology protects the chocolate in the steel from melting away under the heat produced by longer sustained rates of fire... so it's not as much of a concern now. |
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Posted: 4/18/2017 1:27:45 PM EDT
[#23]
Throat erosion from gas checking, exacerbated by increased chamber temp.
MG42 has a way higher cyclic rate than any other belt-fed GPMG that I know of, so barrel changes are required more frequently. |
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Posted: 4/18/2017 1:27:46 PM EDT
[#24]
I wish I had a MG so I could ruin barrels
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Posted: 4/18/2017 1:28:39 PM EDT
[#25]
I got nothing.
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Posted: 4/18/2017 1:28:46 PM EDT
[#26]
Quote HistoryQuoted:
and it creates fruit plates x87 Quote HistoryQuoted:
Quoted:
It gets very cold when firing and it will form ice that bends the barrel.  .
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Posted: 4/18/2017 1:29:43 PM EDT
[#27]
Quote HistoryQuoted:
01ers. 
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Posted: 4/18/2017 1:29:54 PM EDT
[#28]
Quote HistoryQuoted:
TRUTHER! |
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Posted: 4/18/2017 1:30:46 PM EDT
[#29]
Heat (as in very hot) how does it work?
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Posted: 4/18/2017 1:32:09 PM EDT
[#30]
Talking about "Fuck, that's hot", a fellow knife maker told me that when a knife comes out of the oil quench, if the knife is still around 500-700 degrees, you can use thick welder's gloves to bend any minor warps out of the blade. I asked how thick the gloves needed to be, and his response was, "Oh, you will know right away whether they were thick enough or not". He was right.
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Posted: 4/18/2017 1:33:18 PM EDT
[#31]
Quote HistoryQuoted:
Barrels are steel. Bullets make fire. Therefore, bullets brought down the towers. Makes about a smuch sense as nano-thermite, shaped charges and cruise missles. |
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Posted: 4/18/2017 1:34:14 PM EDT
[#32]
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Posted: 4/18/2017 1:36:01 PM EDT
[#33]
Quote HistoryQuoted:
Makes about a smuch sense as nano-thermite, shaped charges and cruise missles. |
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Posted: 4/18/2017 1:36:36 PM EDT
[#34]
wrap the barrel in bacon and cook it off.
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Posted: 4/18/2017 1:38:20 PM EDT
[#35]
Quote HistoryQuoted:
The cruise missiles that hit the Pentagon? I thought so, but maybe some guys in the Pentagon were fucking around with a machine gun and forgot to switch barrels and started a chain reaction. |
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Posted: 4/18/2017 1:39:08 PM EDT
[#36]
Two words: Jet Fuel Bullets.
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Posted: 4/18/2017 1:40:08 PM EDT
[#37]
Quote HistoryQuoted:
I thought so, but maybe some guys in the Pentagon were fucking around with a machine gun and forgot to switch barrels and started a chain reaction. |
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Posted: 4/18/2017 1:40:39 PM EDT
[#38]
Quote HistoryQuoted:
Those mother fuckers! Had to CYA and lied about it. |
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Posted: 4/18/2017 1:40:55 PM EDT
[#39]
And a bunch of tracer rounds in the mix will really add to the heat.
Not to mention set brush and grass on fire. Sucks to be downrange for any of that. |
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Posted: 4/18/2017 1:43:05 PM EDT
[#40]
Quote HistoryQuoted:
And a bunch of tracer rounds in the mix will really add to the heat. Not to mention set brush and grass on fire. Sucks to be downrange for any of that. 
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Posted: 4/18/2017 1:44:07 PM EDT
[#41]
The hot side stays hot and the cool side stays cool.
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Posted: 4/18/2017 1:51:08 PM EDT
[#42]
Just have a guy pour Valvoline all over it as you shoot.
...or was it Quaker State? |
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Posted: 4/18/2017 1:52:10 PM EDT
[#43]
I like this thread..
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Posted: 4/18/2017 1:56:46 PM EDT
[#44]
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Posted: 4/18/2017 1:58:16 PM EDT
[#45]
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Posted: 4/18/2017 2:00:14 PM EDT
[#46]
 ULTIMATE AR-15 MELTDOWN! |
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Posted: 4/18/2017 2:19:05 PM EDT
[#47]
Steel under load starts to bend when it is not all that hot.
At an intense red glow in the middle of a 36 inch long 1/2 inch diameter drill rod and it will bend to 90 degrees under its own weight. Rifling? We don't need no damn rifling. |
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Posted: 4/18/2017 2:21:40 PM EDT
[#48]
Quote HistoryQuoted:
Steel under load starts to bend when it is not all that hot. At an intense red glow in the middle of a 36 inch long 1/2 inch diameter drill rod and it will bend to 90 degrees under its own weight. Rifling? We don't need no damn rifling. 
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Posted: 4/18/2017 2:23:27 PM EDT
[#49]
Quote HistoryQuoted:
And a bunch of tracer rounds in the mix will really add to the heat. Not to mention set brush and grass on fire. Sucks to be downrange for any of that.
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Posted: 4/18/2017 2:25:47 PM EDT
[#50]
Krauts used turtles to cool their MG42 barrels, they ran out of turtles and lost the war.
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