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Posted: 7/23/2010 10:47:53 PM EDT
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1.Whats the difference between this material 11595E - Barrel Steel and 4150 Chromoly Vanadium Alloy.
2.Which one is better? 3.Are they the same thing? 4. Thank you for answering noobish questions 
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Well the first question is one I would like to know. I think, using country boy sense, that the 11595E steel is Minimi barrel metal but that doesnt explain much and I hear they are double chrome lined. I think 4150 is the commercial "bad a$$", "top tier" ie. metal.
Does anyone know the mixture formula? I am asking. |
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Quoted:
Well the first question is one I would like to know. I think, using country boy sense, that the 11595E steel is Minimi barrel metal but that doesnt explain much and I hear they are double chrome lined. I think 4150 is the commercial "bad a$$", "top tier" ie. metal. Does anyone know the mixture formula? I am asking. BCM barrels are not double chrome lined. I believe the 11595E rating has to do with the barrels additional strength and rigidity from an increase in carbon and/or vanadium in the alloy. It offers increased barrel life and performance in extreme environments and temperatures. 4150 is a fairly typical barrel metal, it works fine and should not be worried about. BCM and Spike's do not openly say who makes their barrels, nor do most other companies. |
Here's another fairly recent thread on this subject: AR-15»AR Discussions> Mil-Spec 11595E - Barrel Steel
And, IIRC, someone from BCM recently said on another thread that they don't divulge the source or sources for their barrels. |
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MIL-B-11595E is the Mil-spec that defines the criteria that the barrel material must meet. 4150 is the material that is commonly used to meet that specification.
Noveske barrels (non-SS) are all built to the TDP for M249 SAW barrels. No one seems to know what the steel is, but that spec does call for a chrome lining that is twice as thick as used on the M16/M4. |
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Quoted:
BCM barrels are not double chrome lined. I believe the 11595E rating has to do with the barrels additional strength and rigidity from an increase in carbon and/or vanadium in the alloy. It offers increased barrel life and performance in extreme environments and temperatures. 4150 is a fairly typical barrel metal, it works fine and should not be worried about. BCM and Spike's do not openly say who makes their barrels, nor do most other companies. i believe this is the correct answer. added carbon and vanadium. that being said, 4150 is good stuff. daniel defense makes their barrels out of 4150. definitely not junk barrels. |
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Quoted:
1.Whats the difference between this material 11595E - Barrel Steel and 4150 Chromoly Vanadium Alloy. MIL-B-11595 is a military specification that lays out requirements for three barrel steels when they are intended for use in small arms barrels. It is not a material per se. To use it, you would specify which of the three steels you were interested in, then name the specification you wished them prepared to. In the context of AR-15s, this design was intended to use Chrome-Moly-Vanadium steel per MIL-B-11595E for barrels. But, many aftermarket companies are actually using 4150 Mod. exactly what is in this 4150 Mod is unknown, as no company has yet been open about it, but it is likely 4150 per ASTM A29 with 0.2% vanadium addition. 2.Which one is better? The CMV referenced above seems to have been designed to have high red hardness, providing longer life in sustained, shoot 'til destruction full auto. You will never in a million years notice the difference. 3.Are they the same thing? If you are comparing MIL-B-11595 to 4150, no, one is an alloy, the other is a piece of paper. If you are comparing Chrome-Moly-Vanadium steel per MIL-B-11595E to 4150 Mod per ASTM A29, no, they are slightly different compositions and somewhat different inspection requirements. Either way, the answer is no. 4. Thank you for answering noobish questions 
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