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Agreed. Look at how crappy some Armalites can be for accuracy, compared to something like an MP5, the Armalite is only held in place by the hop up really, where an MP5 has the hop up, the steel bracket to hold the inner barrel to the cocking tube, and the front sight at the muzzle.
He's a good example: KSC Glocks have a free floating inner barrel with a thin O-ring around the barrel, and are only held in place by the hop up unit. When the slide is in battery, you can stick a pen tip in the muzzle and see how much the inner barrel moves around, typically it can be a couple millimeters in every direction. Add a thicker O-ring, or wrap it up with electrocution tape and juggle tightness with slide disengaging ability. Doing the tape mod to reduce the moving around will give about a 75% increase in accuracy, vs. the rough 25% increase by just adding a tightbore. Ball park numbers, but I've done both and found a massive increase in accuracy and consistancy with the O-ring tape mod, but a minor increase with a tightbore.
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