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Anyone that thinks suck back is a thing is an absolute moron. The suck back theory is a poorly thought out idea made by people suffering from tappet plate pre engagement who were too stupid to figure out how to solve the issue at hand. Suck back is not possible because the nozzle breaks the seal with the barrel before the piston even begins to retract. The guy that wrote that has no idea how to build high end AEGs.
As far as barrel length and accuracy goes, most people seem to think 300-450 is the ideal barrel length. I think that that's all blabber. I had a M14 with a 550mm Prometheus barrel. I had setups with 509, 455, 433, 407, 363, 318, 300, 285, 260, and 247mm Prometheus barrels. Accuracy was pretty much the same.
The reasoning for the theory that 450mm is the longest effective barrel length for AEG makes sense, in that after a certain point you run out of air volume and pressure to center the BB in the barrel. If you have a flawless air seal and are shooting 400 FPS or higher, than you can exceed 450mm without detrimental effects to accuracy. The easiest way to determine the longest barrel length your setup can support is to gradually try longer barrels until you stop gaining FPS from having a longer barrel. From 509mm to 550mm I went from 445 FPS to 455 FPS.
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