Quoted: the gas tube will fail before the barrel. there's a pic of the cav arms guys holding a rifle with a melted gas tube which proves this. it was from multiple beta dumps.
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I wonder if that was just because some gas tubes are poorer quality than others.... because in the military testing... the barrel failed every time.... before the gas tube. One pic from Cav Arms doesnt really "prove" anything.... but it is good data. The .mil testing was done in a controlled environment with the M4 and M16.... and the gas tubes held.
Now here is something a little more interesting... we have two documented gas tube failures on the board:
The cav arms failure occurred on a "shorty" rifle just after 200 rounds from a beta. Treedawgs gas tube failure happened the same way: A few differences here:
1. Both of the above gas tube failures occured on shorty barrels.... like 10.5" barrels. These require a larger gas port in the barrel to run.... so more gas could be moving down those tubes... and the bullet is in the barrel for a shorter amount of time.
2. The beta on FA is dumping 100 round bursts... which will see different temps than the .mil testing, which was from FA bursts... from 30 round mags... with 10 second mag changes.
3. We dont know the source of the shorty gas tubes.... we assume they are from .mil contractors.... but dont know that.
So.... I suppose there are some differences here... I'd like to see someone do several beta dumps on a M16 or M4.... and see if the gas tube suffers in the same way.... but I dont know anyone brave enough to try it!
Cav Arms failure:
.mil failures: