Robocop1051 Posted August 6, 2010 Report Share Posted August 6, 2010 Is there a measuurable difference in ballistics and/or bullet performance when you compare the varying lengths of gas tubes? I have seen every type of barrel-length:gas-tube combination. I'm looking at buying a custom 18" barrel and I want to optimize my performance. Quote Link to comment Share on other sites More sharing options...
98Z5V Posted August 6, 2010 Report Share Posted August 6, 2010 The gas tube isn't going to have anything to do with accuracy, unless... You can run it too short (think carbine gas tube length in a 20" barrel), and have the rifle cycling extemely hard. That would have the bolt unlocking very, very fast, and it would kick like crazy (which would wipe out chances of accurate follow-up shots). In addition, cycling that hard will affect the life of the moving/interfacing hard parts.It's pretty important on the AR-15s, but the .308s will cycle just about any combination. I'd go as long as you can on the gas tube length (rifle-length tube), and have it shooting as soft as possible. Even then, you might be needing a heavy buffer, or Tubb's CWS, in order to soften it up as much as you can. If you can give your bolt the longest lock time possible, that'll have the greatest effect on follow-up shot accuracy. Mechanical accuracy of the weapon will depend on other things. Quote Link to comment Share on other sites More sharing options...
Robocop1051 Posted August 10, 2010 Author Report Share Posted August 10, 2010 There's nothing longer than "rifle-length"?? Quote Link to comment Share on other sites More sharing options...
survivalshop Posted August 10, 2010 Report Share Posted August 10, 2010 18 " bbl. , go rifle length gas system . My 16" with rifle length gas system works just fine . Quote Link to comment Share on other sites More sharing options...
survivalshop Posted August 10, 2010 Report Share Posted August 10, 2010 There's nothing longer than "rifle-length"??Not that I'm aware of . Quote Link to comment Share on other sites More sharing options...
cz777 Posted April 21, 2012 Report Share Posted April 21, 2012 The gas tube isn't going to have anything to do with accuracy, unless... You can run it too short (think carbine gas tube length in a 20" barrel), and have the rifle cycling extemely hard. That would have the bolt unlocking very, very fast, and it would kick like crazy (which would wipe out chances of accurate follow-up shots). In addition, cycling that hard will affect the life of the moving/interfacing hard parts.It's pretty important on the AR-15s, but the .308s will cycle just about any combination. I'd go as long as you can on the gas tube length (rifle-length tube), and have it shooting as soft as possible. Even then, you might be needing a heavy buffer, or Tubb's CWS, in order to soften it up as much as you can. If you can give your bolt the longest lock time possible, that'll have the greatest effect on follow-up shot accuracy. Mechanical accuracy of the weapon will depend on other things. this will effect life of the weapon over all ! di system is not so nice if you port before a curtain point in the pressure crave of the barrel ......so why push a weapon to a early grave and you too! Quote Link to comment Share on other sites More sharing options...
jeffreyC Posted April 21, 2012 Report Share Posted April 21, 2012 From what I can find about the .308AR, the only time to have a gas tube shorter than rifle length is if it would put the gas block in front of the muzzle.The .308 has plenty of gas, over-gassing is more likely than under. Quote Link to comment Share on other sites More sharing options...
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