Assertion: marker's barrel | /r/HasAspect | large porting
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text: For example, if a 410-millimetre (16 in) barrel has large porting that starts 150 mm (5.9 in) past the threads, the ball must travel the other 250 millimetres (9.8 in) largely on its own momentum, losing speed (due to friction) rather than gaining more speed from continued air pressure.