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Posted: 12/30/2010 2:30:40 PM EDT
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How many people run middy piston systems? If you do, any problems?
Does the longer operating rod cause more or less stress on the system? It seems like having a longer rod on a short stroke system, would put more stress on the rod itself. I am also assuming the pressure curve is similar to a carbine system, but honestly I do not know. Does anyone have any information specifically on middy systems? |
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The mid-gas system lets the chamber pressure drop before trying to jerk the case out of the chamber, it puts less stress on the bolt lugs, cam pin , cam pin area of the bolt and the cam pin slot in the carrier.
Pressure on the OP rod is less with a mid gas system. |
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OP, I would say it's about a wash. You get lower pressures at the gas port with a mid-length system and a milder cycling impulse. In a mid-length, the op-rod is longer and more easily bent due to its extra length, but this issue is probably negated by its milder impulse. Conversely, a carbine length system has higher gas port pressures and a more forceful cycling impulse. The op-rod in the carbine is shorter and theoretically should be able to handle the higher pressures without flex. You just get rougher cycling with a carbine.
I would go with the mid-length simply for the benefit of smoother cycling and less jolt overall. |
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