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Timing Analysis of Unlocking Cycle for M1 and M14

This is a discussion on Timing Analysis of Unlocking Cycle for M1 and M14 within the Reference forums, part of the M14 M1A Forum category; Originally Posted by politici ad mortem Wait a second, if all the gas is trapped behind and driving the projectile prior to escaping through the ...


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Old March 15th, 2017, 10:18 AM   #16
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Originally Posted by politici ad mortem View Post
Wait a second, if all the gas is trapped behind and driving the projectile prior to escaping through the gas port in the barrel, the only way to affect that pressure would be with more powder behind the round, wouldnt it?
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I don't understand what you are asking about ...

The 'type' of powder affects the barrel pressure as the bullet travels from chamber to muzzle.
A 'fast burning' powder produces a quick 'burst' of high pressure that only lasts a short time, so the 'barrel pressure' decreases rapidly as the bullet moves forward.
A 'slow burning' powder produces a longer lasting high pressure period, so the pressure in the barrel stays high even as the bullet moves forward.

For gas-operated rifles it's necessary to have the barrel pressure be within a useful range when the bullet passes the gas port.

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Old March 15th, 2017, 02:38 PM   #17
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Originally Posted by politici ad mortem View Post
Wait a second, if all the gas is trapped behind and driving the projectile prior to escaping through the gas port in the barrel, the only way to affect that pressure would be with more powder behind the round, wouldnt it?
No, different propellants have different burn rates and different pressure curves.

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