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Discussion Starter · #1 ·
Soooooo I've read that an inner barrel 450mm to 500mm is ideal for most guns with a cylinder volume like the Type 96/ Maruzen.

By the way, I'm aiming for better accuracy at a close distance <100ft (not for skirmishes.)

Planning to buy another TBB very soon. Any recommendations?

Top choices right now:

6.01 EdGi 499mm
6.03 Prometheus 509mm (or Perhaps > 550mm since hop-up isn't much of an issue)
6.01 Madbull 509mm
 

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Discussion Starter · #4 ·
509mm is to long for a type 96, top choice should be 6.01 pdi, IMO best barrel ever, EDGI's used to be top notch but the newer ones manufactured in NJ are not the same quality but should still be top 3
When you say too long do you mean because it sticks out of the outer barrel or accuracy?

Is longer barrel better for closer ranges btw? I know it negatively affects hop up for further ranges, but close ranges I have no clue.

A couple of friends of mine are trying to compete for most accurate sniper rifle at close range ~50ft :cheers:
 

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Discussion Starter · #6 · (Edited)
What you want is the cylinder volume to match the barrel volume. To much and you will get excessive noise, but to little and you wont get the desired shot.
When you say noise, do you mean like a very loud pop sound?
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From my search, nobody ever shared figures regarding the cylinder volume of a Laylax Type96 Cylinder.

I measured the amount of cylinder volume available in front of the piston head once it was cocked (CYL):

Volume (v)= (Length) x (Radius^2) x (Pi)

v= (90mm) x (10mm^2) x (Pi)

v= 28,274.3339mm cubed (CYL)

Now the calculation of a 6.01mm barrel with 499mm length (IB):

v= (499) x (3.005^2) x (Pi)

v= 14,155.9614mm cubed (IB)

So the barrel length ratio:

Ratio= (CYL) / (IB)

Ratio= (28,274.3339) / (14,155.9614)

Ratio= 1.99734465

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This part is slightly off topic

Someone once mentioned that 1.2-1.4 was a good ratio.
I believe that the same person also mentioned that FPS and BB Weight affected the "ideal" ratio desired.

^^^ I haven't tested this, but assuming others agree and he was correct, then what actually matters is the JOULES of force being shot out of the inner barrel.

Therefore a higher joule amount would require a greater CYL/IB ratio.

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Going back on topic, what's an ideal ratio from your experiences?
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In conclusion, Airsoft needs more decisive evidence :doh:.

Note: My measurements done with a millimeter tape measure.
I feel like I may
have measured the cylinder volume wrong so if someone would like to correct me in any way please do so.
 

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I meant just length down the outer barrel,

you are correct that fps and bb weight change the traditional volume ratios. I have a stock type 96 pushing 610 and it is way to much air and turbulence comeing out the barrel with the exact same internals on another I have a 590 MM barrel and it is perfect. From my experience a 590 mm barrel with pdi type 96 internals pushing 600 fps is the perfect combination.
 

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Discussion Starter · #9 · (Edited)
Very interesting :)

Shooting 610fps >:D What gun and spring were you using out of curiosity?

Originally Posted by Cheese Man
If you have a REALLY NICE crown on the barrel, it will decrease a lot of the turbulence and help a lot. Porting helps too, but it requires more precision than most people have access to. ;)

I've read in other forums that porting was inconclusive in terms of positive performance. Is there a significant change in accuracy on your part?

I forget the url link, but I think on the same page someone mentioned a barrel that was drilled in a spiral fashion along the length of the barrel (similar to real silencer designs) to "silence" the gun. Just throwing my find out there :D

I'll look for the link soon.
 

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Very interesting :)

Shooting 610fps >:D What gun and spring were you using out of curiosity?

Originally Posted by Cheese Man
If you have a REALLY NICE crown on the barrel, it will decrease a lot of the turbulence and help a lot. Porting helps too, but it requires more precision than most people have access to. ;)

I've read in other forums that porting was inconclusive in terms of positive performance. Is there a significant change in accuracy on your part?

I forget the url link, but I think on the same page someone mentioned a barrel that was drilled in a spiral fashion along the length of the barrel (similar to real silencer designs) to "silence" the gun. Just throwing my find out there :D

I'll look for the link soon.
It is a well mb08 with a pdi 170sp
 
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