Quoted: Don't worry this isn't another 4140 vs 4150 thread. I understand the 4150 is a better barrel able to withstand more rounds at a faster rate. But I have specific questions. In what civilian applications would a 4140 metal barrel not be good enough? Burining through seveal mags as quick as you can pull the trigger on a semi? Would a select fire weapon be good for a few mags? Everyone says the difference in 4140 and 4150 is a moot point because most civilians or police would never use a 4150 barrel to it's full potential. Just curious to what anyone thinks.
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I'll answer your question, hopefully directly.
4140 would be good enough for 99.9% of civilian shooting. I have seen 9 mags dumped through a 4140 barrel, with no immediate ill effects on the barrel. The handguards were toast, but the barrel seems fine.
The only thing I could think of, as a civilian, that might hurt it would be purposely abusing the weapon on full auto, to the point at which your gas tube melted, and your rounds were self detonating in the chamber due to the heat buildup.
Other than abuse, I can't think of a single situation that 4140 might not be good enough.
That being said, I have only 4150 5.56 barrels. Why? It's a little hard to find top quality barrels in 1:7 twist made in 4140. That's the only reason. Honestly. The reason I prefer 1:7? They are proven to stabilize the longer and heavier 75gr and 77gr ammo -- and all my 5.56 barrels are under 15".