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Posted: 9/18/2016 3:56:43 PM EDT
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I normally use BCM but they are out of stock. Joe Bobs has these in stock. I asked them if it was 6061 or 7075 T6 and this is the response given. Am I good with this anyway?
They are actually neither alloy, but they are a 70 series aluminum. They are similar but not exactly the same thing. 7075 is a '70 series' aluminum. There are numerous 70 series aluminums out there, but 7075 is the most common in the aviation and firearm world. http://www.joeboboutfitters.com/Mil_Spec_6_position_Stock_Hardware_Kit_AR15_p/jb-milspeckit.htm?CartID=1 |
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http://www.joeboboutfitters.com/BCM_Milspec_Carbine_Stock_Hardware_MOUNTING_KIT_p/bcm-stock-hardware-kit.htm
They are listed as "7075-T6" though. |
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http://www.joeboboutfitters.com/BCM_Milspec_Carbine_Stock_Hardware_MOUNTING_KIT_p/bcm-stock-hardware-kit.htm They are listed as "7075-T6" though. The one in his link is not specifically listed at 7075-T6, the listing does not say what it is, but if it is a 70 series tube as their answer states it is, it is fine. |
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The one in his link is not specifically listed at 7075-T6, the listing does not say what it is, but if it is a 70 series tube as their answer states it is, it is fine. Quoted:
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http://www.joeboboutfitters.com/BCM_Milspec_Carbine_Stock_Hardware_MOUNTING_KIT_p/bcm-stock-hardware-kit.htm They are listed as "7075-T6" though. The one in his link is not specifically listed at 7075-T6, the listing does not say what it is, but if it is a 70 series tube as their answer states it is, it is fine. His link does not work for me |
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His link does not work for me Quoted:
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http://www.joeboboutfitters.com/BCM_Milspec_Carbine_Stock_Hardware_MOUNTING_KIT_p/bcm-stock-hardware-kit.htm They are listed as "7075-T6" though. The one in his link is not specifically listed at 7075-T6, the listing does not say what it is, but if it is a 70 series tube as their answer states it is, it is fine. His link does not work for me Here it is, his link was not live and it had a q in front of the http http://www.joeboboutfitters.com/Mil_Spec_6_position_Stock_Hardware_Kit_AR15_p/jb-milspeckit.htm?CartID=1 |
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If you normally use BCM then I am not sure I would substitute for a discount tube with a sketchy answer on material composition OP. 6061 AND 7075 are the norm. Just my opinion tho. All the 70 series aluminum are the same hardness, but there is a number of different designations for them. My Dad worked in a machine shop for a number of years and they used a lot of different 70 series aluminum depending on the job it was for and the cost involved. Like I said, I have purchased from Joe Bob's in the past and would have no reason to question them if they said it is a 70 series tube. |
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All the 70 series aluminum are the same hardness, but there is a number of different designations for them. My Dad worked in a machine shop for a number of years and they used a lot of different 70 series aluminum depending on the job it was for and the cost involved. Like I said, I have purchased from Joe Bob's in the past and would have no reason to question them if they said it is a 70 series tube. Quoted:
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If you normally use BCM then I am not sure I would substitute for a discount tube with a sketchy answer on material composition OP. 6061 AND 7075 are the norm. Just my opinion tho. All the 70 series aluminum are the same hardness, but there is a number of different designations for them. My Dad worked in a machine shop for a number of years and they used a lot of different 70 series aluminum depending on the job it was for and the cost involved. Like I said, I have purchased from Joe Bob's in the past and would have no reason to question them if they said it is a 70 series tube. All 7000 series are not the same hardness. 6061-t6=35000 psi yield strength 7075-0=NOT heat treated /40000 psi yield 7075-t6= 74-78000 psi yield Hardness is achieved via heat treating. Anyhow, OP, I would stick to the quality you know and are accustomed to. Again, just my opinion. Facts do not lie. Good luck! |
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All 7000 series are not the same hardness. 6061-t6=35000 psi yield strength 7075-0=NOT heat treated /40000 psi yield 7075-t6= 74-78000 psi yield Hardness is achieved via heat treating. Anyhow, OP, I would stick to the quality you know and are accustomed to. Again, just my opinion. Facts do not lie. Good luck! Quoted:
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If you normally use BCM then I am not sure I would substitute for a discount tube with a sketchy answer on material composition OP. 6061 AND 7075 are the norm. Just my opinion tho. All the 70 series aluminum are the same hardness, but there is a number of different designations for them. My Dad worked in a machine shop for a number of years and they used a lot of different 70 series aluminum depending on the job it was for and the cost involved. Like I said, I have purchased from Joe Bob's in the past and would have no reason to question them if they said it is a 70 series tube. All 7000 series are not the same hardness. 6061-t6=35000 psi yield strength 7075-0=NOT heat treated /40000 psi yield 7075-t6= 74-78000 psi yield Hardness is achieved via heat treating. Anyhow, OP, I would stick to the quality you know and are accustomed to. Again, just my opinion. Facts do not lie. Good luck! Now, talking about heat treating is talking a completely different subject. OP, buy what feels right for you, I have 6061 tubes and 7075 tubes and none of them have ever failed on me, so get what feels right for you. |
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Now, talking about heat treating is talking a completely different subject. OP, buy what feels right for you, I have 6061 tubes and 7075 tubes and none of them have ever failed on me, so get what feels right for you. Quoted:
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If you normally use BCM then I am not sure I would substitute for a discount tube with a sketchy answer on material composition OP. 6061 AND 7075 are the norm. Just my opinion tho. All the 70 series aluminum are the same hardness, but there is a number of different designations for them. My Dad worked in a machine shop for a number of years and they used a lot of different 70 series aluminum depending on the job it was for and the cost involved. Like I said, I have purchased from Joe Bob's in the past and would have no reason to question them if they said it is a 70 series tube. All 7000 series are not the same hardness. 6061-t6=35000 psi yield strength 7075-0=NOT heat treated /40000 psi yield 7075-t6= 74-78000 psi yield Hardness is achieved via heat treating. Anyhow, OP, I would stick to the quality you know and are accustomed to. Again, just my opinion. Facts do not lie. Good luck! Now, talking about heat treating is talking a completely different subject. OP, buy what feels right for you, I have 6061 tubes and 7075 tubes and none of them have ever failed on me, so get what feels right for you. Actually no. You stated that "all 70 series are the same hardness". They in fact are not. 7075-0 material is only 5000 psi stronger than 6061-t6. 7075-t6 is near double the strength (due to heat treat which designates the"t6". It is not another subject, rather a factual account of the material makeup. I would not spend double the money on a tube that is barely stronger based on some random opinion nor what someone from Joe Bobs conveyed to me in a discussion. That being said, our military does not use 6061, I choose not to, now OP has some facts on which tube to choose. |
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Actually no. You stated that "all 70 series are the same hardness". They in fact are not. 7075-0 material is only 5000 psi stronger than 6061-t6. 7075-t6 is near double the strength (due to heat treat which designates the"t6". It is not another subject, rather a factual account of the material makeup. I would not spend double the money on a tube that is barely stronger based on some random opinion nor what someone from Joe Bobs conveyed to me in a discussion. That being said, our military does not use 6061, I choose not to, now OP has some facts on which tube to choose. Quoted:
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If you normally use BCM then I am not sure I would substitute for a discount tube with a sketchy answer on material composition OP. 6061 AND 7075 are the norm. Just my opinion tho. All the 70 series aluminum are the same hardness, but there is a number of different designations for them. My Dad worked in a machine shop for a number of years and they used a lot of different 70 series aluminum depending on the job it was for and the cost involved. Like I said, I have purchased from Joe Bob's in the past and would have no reason to question them if they said it is a 70 series tube. All 7000 series are not the same hardness. 6061-t6=35000 psi yield strength 7075-0=NOT heat treated /40000 psi yield 7075-t6= 74-78000 psi yield Hardness is achieved via heat treating. Anyhow, OP, I would stick to the quality you know and are accustomed to. Again, just my opinion. Facts do not lie. Good luck! Now, talking about heat treating is talking a completely different subject. OP, buy what feels right for you, I have 6061 tubes and 7075 tubes and none of them have ever failed on me, so get what feels right for you. Actually no. You stated that "all 70 series are the same hardness". They in fact are not. 7075-0 material is only 5000 psi stronger than 6061-t6. 7075-t6 is near double the strength (due to heat treat which designates the"t6". It is not another subject, rather a factual account of the material makeup. I would not spend double the money on a tube that is barely stronger based on some random opinion nor what someone from Joe Bobs conveyed to me in a discussion. That being said, our military does not use 6061, I choose not to, now OP has some facts on which tube to choose. You seem to like to argue, if I was really concerned, I would give Joe Bob's a call and actually talk to them, I have before and they have always answered my question. I know what our Military uses, I spent almost 30 years in the Army, part of that working in the armory.. There is plenty of stuff that the Military uses and is not required in civilian life. But he asked, we all offered our opinions, now it is up to him to decide on what he wants to buy, plain and simple, our opinions are just that, opinions. That said, I don't take this very seriously, because most of us are never going to be in a SHTF situation, so purchase based on your pocket book and your desires. You never know, Joe Bob's might have a tube that is made out of 7075-T651 which is 83,000 PSI and a Yield strength of 500 MPa Anyway, over and out. Have a good evening Tig. Good luck in your quest OP |
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Your view of me is that I enjoy arguing. Your view is askew as was your statement on material properties , DaveP1. Being that this is a Tech forum, technically,facts should be correct.I simply corrected the mis quote. I intended no harm/malice and if that is what you perceived I am sorry if I offended you.
OP asked a question, several gave opinions. "Am I gtg?" is pretty broad. We have no inclination as to the use this weapon will serve nor what abuse it will sustain. Only that, from the sound of things, this "70 ish" tube is not as strong as BCMs 7075-T6 tube. I am not an expert, nor do I claim to be. Only offering my opinion and presenting factual data. As far as your background/service, not sure what role mentioning that served? Your opinion is still valued on the same scale as anyones, imo. Just 0.02. Enjoy your evening. And hopefully, OP, you can now make an informed decision. |
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When I worked in the armory, I replaced more than my share of tubes because of stupid mistakes by others, one thing about metals, the harder it gets, it also gets more brittle to the types of hits it can take, when in the Army we actually tried some tubes made out of 7075-T651 and those suckers broke left and right, they were hard, but they were very brittle. So there are a different number of things to look at when talking about metals, especially aluminum. Like I said, I have a couple of rifles with 6061 tubes on them and they have not given me any problems, but I really don't abuse my rifles and I hope I am never in a SHTF situation again!
I didn't make my statement correctly when talking about 70 series alloy's sorry about that, but when talking about gun parts, they are all hardened aluminum no matter what alloy they are, that is unless you get a hold of an airsoft tube, which is a bad thing, I have seen those blow the back of the tube out when using them on an AR platform gun. |
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Some of the alloys are really expensive, way to much for what most of us do.
I was at the shop that my Dad worked at last month when we interred him and they had just got an order in of aluminum for a custom job they were doing and just the materials was over a million dollars!, I can't imagine what the company will be paying after they get done with all the machine work! 
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We have several sheets of 3CR12 material in shop atm...$15k /sheet. Alot of 2209 SS and Alloy 36 also, our mills are running 12/6 weekly. But off subject
As far as tubes go, brand means nothing to me. Material and performance reviews along with personal experiences guide my hand. I try to obtain the highest degree of quality that finances allow. I started with alot of early UTG shit and similar. Ended up rebuilding 3 carbines at a loss. |
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