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Posted: 7/3/2008 10:32:09 PM EDT
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My search fu is weak.... A long time ago, didn't we have someone test 4140 AR barrels to failure? I want to say they posted pics and the round count was higher than expected at a full auto volume. It was maybe even DPMS barrels... If anyone could help me find it, I would appreciate it! Thanks! |
| I would like to see this to, I have never heard bad things about a 4140 barrel.. I have a 4140 HBAR on my Armalite and It shoots sub moa at 100 yards.. I didnt think I would get .80" at 100 yards with a stock armalite barrel... but I know armalite makes good stuff or at least uses it.. |
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For a long, long time 4140 and its slight variants into 4150 has been used to make barrels. throughout WWII ( perhaps even earlier) until present, barrel manufactures has used 4140 type steels. Of course there is also the 400 series of stainless steels being used too. The slight diffrences in 4140 - 4150 is very small, some may have a bit more sulfur for ease of machinablity ( keeps cost down on tooling wear, faster to machine etc). Some may have a higher bit of chromium content etc, but these differences are very, very slight. For the sake of argument if they varied to far off the ANSI standards in 4140 or any steel for that matter, the steel would have to be reclassified. Thats why I would pit a 4140 barrel against a 416 stainless barrel any day of the week for longer life, for the simple fact the 4140 barrel is harder to machine than the 416 stainless barrel....416 machines like butter. I guess you can get any barrel to fail if you try hard enough |
416 looses its accuracy faster than 4140. We killed a 4140 in 825 rounds. Final Report: AR15 1000 Round Full Auto Test |
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