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  #1  
Old 01-04-2016, 11:01 PM
Barry l brian Barry l brian is offline
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Default 4140 barrell

I saw a u-tube video that did not recommend 4140 steel for barrels. What does that mean for the m& p 10 which I believe does use this steel?
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Old 01-05-2016, 02:10 PM
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It is not as good as some of the other barrels out there but only applies if you do a heck of a lot of shooting. For the average person, it's a none issue.
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Old 01-06-2016, 01:35 PM
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4140 has been used for decades + for firearms barrels and has been more than up to the task. If I liked a firearm enough to buy it, 4140 would not be i disqualifier.
Jim
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Old 02-25-2016, 08:13 PM
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If you are not doing mag dumps, the 4140 is good. A very high volume shooter might have need of the 4150.
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Old 02-28-2016, 08:30 PM
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Default " I saw a YOUTUBE VIDEO. . . ."

removed . . .

Last edited by jrabenius; 02-29-2016 at 02:40 PM.
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Old 02-29-2016, 01:26 PM
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I always like to think of how much money I will have spent on ammo in order to wear out a barrel. Hint: It's *way* more than the cost of a $200 - $300 barrel.
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Old 03-01-2016, 10:33 AM
Jim Watson Jim Watson is offline
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If you stay interested long enough to wear it out, then look at a nitrided barrel which will last even longer.
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Old 03-03-2016, 02:58 AM
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The M&P barrels are nitrided, unless they have changed since introduction.
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Old 04-23-2016, 06:22 PM
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A 4150 steel barrel has a slightly higher carbon content making the steel slightly harder than that of a 4140 barrel. Ideally a 4150 barrel should last longer and stand up to a little more abuse, but the average shooter will do just fine with the 4140 barrel.
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Old 10-15-2016, 02:17 PM
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Even Century Arms' cheap AK has upgraded barrel from 4140 to 4150 steel...
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Old 03-04-2017, 12:45 AM
M&P10 owner M&P10 owner is offline
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I get the impression that many here don't know what "Nitriding" does to steel. S&W Nitrides the barrels (inside and out) causing the steel to be extremely hard and rust-proof. Discussions of barrel steels are pretty much moot when barrels are Nitrided.
Machine gun barrels are Nitrided for durability.
Do yourself a favor and look up Nitrocarburizing or Nitriding on Wikipedia.
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Old 03-05-2017, 09:40 AM
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I like these comparisons between 4140 and 4150 steel.....very friggn good steel (4140) for firearms vs a little bit better than that steel (4150)
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Old 03-05-2017, 08:49 PM
WR Moore WR Moore is offline
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Quote:
Originally Posted by M&P10 owner View Post
Machine gun barrels are Nitrided for durability.
Actually, many machine gun barrels have stellite lining. Look at the price tags for M2 variant barrels.

Per the former commander of the USAMTU, buy nitrided for an accuracy edge. Hard chrome lined for rapid fire use.
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