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All a holed cylinder does is more accuratly balance the volume ratio for the barrel/ cylinder combo.

For your 509mm barrel a full cylinder is ideal and will not require any modification by your self.

What you will find if you use the full cylinder with a short barrel is your accuracy will drop a bit and also the noise of the weapon will increase by alot, this is a result of the over pressure caused by the extra air not being used to propel the BB, other than that it will not harm your gun at all.

I used to do exactly the same thing on my SPR, I had a Long Sniper upper and a Short Assault upper that I just swapped over onto my existing lower reciever, all using a full type '0' cylinder.

What alot of people don't under stand is there is alot more to it than just buying a barrel and then getting a cylinder that roughly matches the length of that barrel. You also need to take into account the internal diameter of the barrel, what weight of ammo you intend to use, as obviuosly it takes a hell of alot more air to shift a .3 than it does a .2, the over all efficiency of your system etc etc

It realy depends on how far you want to take it, as you can do as I do, and run a slightly shorter barrel, which I then tune the cylinder to the ammo that I'm using, this then gives me a little extra capacity in the cylinder which I then tune by drilling my own vent holes, that then allows the piston to build up some motive force before it starts its compression stroke, this then gives a little more fps and increases the overall efficiency of the system even further
 

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ruffles said:
I plan on using a 6.03 509 TBB and use .25 bb's. How do i find out how far up the holes ill be drilling in the cylinder need to be?
Noart sort of had a relavent question there, what fps are you aiming for?

I only use .25s in my CQB 330 fps gun, everything 350fps and above I use .28s, including my pistol, the exception being my VSR when its sprung for 500fps when I use .36s.

As for porting, if you plan on a 509mm barrel and use .28s you'll be spot on with a full cylinder as it is, no need to drill anything, if you are going to stick with .25s then i'd recommend a cylinder volume ratio of 1.75 times the volume of the barrel.
 

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A building trade glue called ' Mitre Bond', basicaly a super fast setting super glue ( Cyanoacrilicate).

Be aware they can fall off during use in any case, Laylax make a similar thing for the VSR and they are concidered a disposable item that will inevitably fall off in the in any case as no glue can fully with stand the constant hammering :-/
 
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