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easiest way to measure "barrel suck" would be to measure velocity on single shot and full auto. there would be zero barrel suck on semi as the piston will stop at the end of it's compression stroke and the velocity difference between semi and full would have to be due to barrel suck, all other things being equal. you also brought up an interesting notion on dry firing. so what happens to guns where guys use low-caps and there is always dry firing at the end of each mag (10-15% depending on mag capacity). do these guys put undue stress on their guns when you couple this with the dy firing that occures during testing and weapons clearing. i seriously doubt it. and does the presence of the bb in the chamber, considering losses around the nozzle/cylinder head junction, nozzle/bb junction. bb/barrel gap and around the hop bucking and chamber apply any measurable resistance to the piston in it's stroke? the mass and velocity difference between the piston in motion vs. a bb at rest are so phenominally different not to mention the discharging air at higher pressure in the barrel "feeding back" energy to a larger, lower pressure area like the cylinder, the laws of physics just don't allow for that hypothesis. the only resistance to be offered by this system would be if the hop-up made a very good seal and the bb required significant force to push its way thru the hop bucking and travel down the barrel. so in essence the back-pressure from bb to piston could only come from the hop system and no place else. so depending how good you hop-up is will determine pressures.
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