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Johndabomb

Cylinder vs Barrel Length

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After reading on a lot on Airsoft forums about barrel length vs cylinder size I am non the wiser. I have an SRC M16A3 and it has a ported cylinder with a 509mm length barrel but what I've read is that if a barrel is longer than 450mm is should not be ported, completely sealed. Would a completely sealed cylinder for my m16 increase the gun's fps? And why would SRC port a cylinder if it isn't needed or useful? Someone please explain.

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From what i just learned from Mr Black they may have done it to decrease fps and make it site friendly.

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