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7/12/2025, 4:57:43 PM
I asked ChatGPT to settle this once and for all
Myth 1: "Brass acts as a heat sink"
Yeah, it does—but that’s not a good thing in this context. Brass transfers heat into the chamber and receiver, not away from it. When a brass case expands, it makes solid contact with the chamber walls and conveys heat into the gun, especially the bolt and barrel extension. That's where your lugs and locking surfaces are—aka places you don’t want excess heat soaking in.
Polymer insulates, meaning:
More heat stays in the case
That heat leaves with the ejected round
Less heat goes into the chamber and bolt face
This is exactly what you want in high-rate-of-fire weapons, which is why LSAT (Textron’s Lightweight Small Arms Technology) and True Velocity have been investing in this kind of tech. The U.S. military wouldn’t be experimenting with polymer cases if they were thermal time bombs.
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Myth 2: "The barrel is taking more heat now!"
Okay… even if this were true (which it marginally is):
The barrel is designed to absorb and radiate heat.
It's got mass, surface area, and is replaceable on LMGs and some DMRs.
You don’t cook off rounds from barrel heat alone unless you’re really doing something stupid. Barrel heat isn't the limiting factor for most guns—chamber heat and bolt temp are.
And let’s not forget: barrels already get smoking hot in sustained fire. That's why MG crews train for barrel changes. That’s not new.
---
So why the hell do people say this?
Honestly? A combination of:
Misunderstanding basic thermodynamics
Parroting half-baked forum theories
Fear of change from traditional brass
That one time a prototype polymer case did fail and melted (which was an early-gen issue, not universal)
Myth 1: "Brass acts as a heat sink"
Yeah, it does—but that’s not a good thing in this context. Brass transfers heat into the chamber and receiver, not away from it. When a brass case expands, it makes solid contact with the chamber walls and conveys heat into the gun, especially the bolt and barrel extension. That's where your lugs and locking surfaces are—aka places you don’t want excess heat soaking in.
Polymer insulates, meaning:
More heat stays in the case
That heat leaves with the ejected round
Less heat goes into the chamber and bolt face
This is exactly what you want in high-rate-of-fire weapons, which is why LSAT (Textron’s Lightweight Small Arms Technology) and True Velocity have been investing in this kind of tech. The U.S. military wouldn’t be experimenting with polymer cases if they were thermal time bombs.
---
Myth 2: "The barrel is taking more heat now!"
Okay… even if this were true (which it marginally is):
The barrel is designed to absorb and radiate heat.
It's got mass, surface area, and is replaceable on LMGs and some DMRs.
You don’t cook off rounds from barrel heat alone unless you’re really doing something stupid. Barrel heat isn't the limiting factor for most guns—chamber heat and bolt temp are.
And let’s not forget: barrels already get smoking hot in sustained fire. That's why MG crews train for barrel changes. That’s not new.
---
So why the hell do people say this?
Honestly? A combination of:
Misunderstanding basic thermodynamics
Parroting half-baked forum theories
Fear of change from traditional brass
That one time a prototype polymer case did fail and melted (which was an early-gen issue, not universal)
6/28/2025, 3:52:01 PM
>>63908067
It's like a stick in the woods you're letting fall in one direction or the other to decide which way to go.
One direction you're clear and you might find a delicious edible plant if you keep your eyes open.
In the other direction there's a horrifying barbarian rape pit.
Fucking stick is so useless but it's deciding so much for you.
Picunrelated
It's like a stick in the woods you're letting fall in one direction or the other to decide which way to go.
One direction you're clear and you might find a delicious edible plant if you keep your eyes open.
In the other direction there's a horrifying barbarian rape pit.
Fucking stick is so useless but it's deciding so much for you.
Picunrelated
6/28/2025, 7:52:21 AM
6/27/2025, 5:41:31 AM
6/13/2025, 10:28:25 PM
>>211702362
La foca
La foca
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