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Ideal Barrel Length

Is there a formula?

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#1 Bullshit Dragon

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Posted 09 June 2009 - 01:17 AM

This came up as I was in the process of rebarreling my NF (it's the gray/green one,) which incidentally had a barrel that was WAAAY too short. I thought about it and I was wondering just what determined the length of a barrel in a springer like the NF. Mine's still not totally assembled because I wanted to know what you guys thought a good barrel length was.

Current Barrel: 3in of 17/32 brass
Possible Replacement: 1/2" CPVC (stefans and stock darts are tight in it)
Spring: FULL Handyman #49
Other mods: Catch spring replaced, frame reinforced, plunger reinforced, plunger head reinforced, seal improved, relubed, ar's removed (given). (I think that's all of them)

If anyone has anything constructive to add, please post, if not please move on. I take enough crap on the boards and I don't really need others adding to it.
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#2 wardrive

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Posted 09 June 2009 - 01:30 AM

Please refer to This thread..
You might find it an interesting read; I certainly did when I first got here..
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#3 Zorns Lemma

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Posted 09 June 2009 - 03:43 AM

Ideal barrel length and material is highly dependent on the darts you are using.
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#4 Carbon

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Posted 09 June 2009 - 06:40 AM

The other guideline is the Boltsniper formula, where barrel volume is 1/4 the volume if the plunger. Explanations and much math here.
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#5 Shrub

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Posted 09 June 2009 - 09:51 AM

According to boltsniper's formula it should be about 2.75"? So the current barrel is just about right.

Edited by Shrub, 09 June 2009 - 09:55 AM.

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#6 Daniel Beaver

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Posted 09 June 2009 - 02:20 PM

Empirical testing works a lot better than formulas. Cut up a bunch of different lengths and try them out. I personally use 4" of CPVC on my NF.
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#7 Carbon

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Posted 09 June 2009 - 03:16 PM

Empirical testing works a lot better than formulas. Cut up a bunch of different lengths and try them out. I personally use 4" of CPVC on my NF.

This bears repeating, and it's why I called Bolt's formula a guideline: use it to give you a starting point, but it's by no means the absolute answer. Trying out a bunch of barrels is great, but can get expensive with certain barrel materials (i.e. brass).
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#8 Bullshit Dragon

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Posted 09 June 2009 - 04:21 PM

After reading both Boltsniper's method and CXWQ's explanation, and with a little trial and error on my part, the final barrel is 4.25" of CPVC.

This topic can end now.
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