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Old 01-18-2015, 03:36 PM   #1
bushes   bushes is offline
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Is 300 mm long enough?

What is the max range/fps you would expect to achieve out of a 300 mm barrel?

My BAR-10 is currently cut down into a short barreled 300 fps scout rifle with iron sights, but I'm looking to get back into some longer ranged sniping. I was wondering if you guys think that I should go back to a full length rifle to get more range or if a 300 mm barrel is enough?

I know that barrel length is much less important than hop up, and that others have built long range SBR's before, however I'm wondering if, as somewhat of an amateur gunsmith, it would be easier to go with a long barreled rifle.

Last edited by bushes; 01-18-2015 at 03:40 PM.
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Old 01-18-2015, 04:51 PM   #2
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You could still reach 300ft+ range with that length, but im not sure how accuracy will be. My JG VSR G-Spec had a short length barrel when I would use with w/ out the silencer and I could hit a 13x13' street sign at 220ft if I aimed above it about 2 feet 2/10 times (stock). It will affect it, I just don't know how much.
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Old 01-18-2015, 06:36 PM   #3
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Theoretically speaking barrel length only has an influence on your fps. They won't affect accuracy so much.

As a matter of fact, the longer the barrel, the more time the bb is going to spend inside the barrel and the more its going to affect its hop and the less consistent your shots will be.

Barrel quality is much more important, theoretically 200mm could be just as accurate as 500mm ;)

p2skater, I assume you meant 13x13", not '? (inch / foot)
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Old 01-19-2015, 12:23 AM   #4
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Barrel length has little effect on range or accuracy. It only effects the FPS for a given spring and ammunition weight.

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Old 01-19-2015, 01:41 AM   #5
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Quote:
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p2skater, I assume you meant 13x13", not '? (inch / foot)
Yes, sorry.
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Old 01-19-2015, 02:00 AM   #6
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Yes 300mm is long enough, hopup is more important.
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Old 01-19-2015, 02:24 AM   #7
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"Size doesn't matter"
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Old 01-19-2015, 11:01 AM   #8
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Thanks for all the responses guys. I guess I'll go for it with the short barrel and see what happens!
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Old 01-19-2015, 11:48 AM   #9
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"Size doesn't matter"
That's what my girlfriend said
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Old 01-21-2015, 03:56 AM   #10
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Something i noticed when going from 300mm stock barrel to 430mm ASG Ultimate 6.03mm, was that the noise that came out the other end was a bit more silent. This most likely has to do with the cylinder to barrel volume ratio.
I consider the sound to be slightly more muffled with the longer barrel than the shorter barrel, but since i run a huge silencer on mine, it really doesn't matter because it's absolutely silent with the silencer attached. (scary silent)

By increasing the barrel lenght, you increase your FPS which can, and most likely will, increase your range. But as others have said, hopup is by far more important and you can most likely get satisfying range and accuracy with your stock 300mm barrel. As long as it's clean. ;)
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Old 01-21-2015, 02:46 PM   #11
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Longer barrels do tend to be quieter.
A TM Socom is about 90 decibels. (This is really quiet and I use this as a base for measuring sound)
A VSR with a 300mm barrel is about 98 decibels. (using 0.45gm bb's)
A VSR with a 370mm barrel is about 96 decibels. This is a notable sound difference. (using 0.45gm bb's)

Using heavier bb's can make you gun quieter.
If you are using a 0.3gm bb in a rifle and want it to be quieter you can use a heavier bb. The heavier bb will use up more of the volume in the cylinder and so creating less noise. But you do need enough volume to push the heavy bb out. In other words, if you have a 500mm long barrel and want to make the gun quieter, do not use a heavy 0.45gm bb as you will not have the volume in the cylinder.
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Old 01-21-2015, 11:56 PM   #12
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Not quite sure on the decibels but my sniper was quite enough that if people were having a normal volume conversation you could not hear it. I used the stock 430mm until I upgrade but I think I might want to get something like 460mm-500mm.
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Old 01-22-2015, 12:59 AM   #13
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500mm should be OK but you cannot use a heavy weight bb. The heaviest I would recommend would be 0.36gm and no more.
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Old 02-11-2015, 01:25 PM   #14
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The gspec is only 303mm long and there's no issues with its accuracy as Ive found so far

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Old 02-11-2015, 08:47 PM   #15
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BB's needs time to settle as it bounce inside the inner barrel. Range and accuracy is propotional to the barrels legth and ID.
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