[lurkingknight]

research will be important... I don't know if the cylinder in the 417 is standard or not, stealth should be able to say. But in terms of upgrading, my experience has shown that bore length doesn't matter as much as the quality of the bore. As long as the barrel has the proper air volume ratio to the cylinder, it's fine. The only reason to go longer is to make sure your BBs will clear a suppressor if it stops short. I've had BBs hit the inside of a silencer can because the inner barrel wasn't completely centered inside.

Other folks that I would trust with the guts of my guns (aside from myself) have done more extensive testing and concluded the optimal barrel length is somewhere between 400-455mm. Beyond that, it becomes cumbersome and diminishing returns.

I personally don't like madbull buckings, but my experience is limited. The few I have tried to install are difficult to seat properly. I don't bother much with standard buckings much anymore.. if it's a standard one, it'll be lonex or pdi W hold. All my personal AEGs are R-hoped.