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Mar 25th, 2012
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Brass AR-10 Lower #7195848
06/12/18 06:25 PM
06/12/18 06:25 PM
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Re: Brass AR-10 Lower [Re: Mickey Moose] #7195849
06/12/18 06:27 PM
06/12/18 06:27 PM
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Lewisville, TX
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The reason why brass is used as an ammunition case it because it's malleable. AR-10 brass lower- malleable.



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Re: Brass AR-10 Lower [Re: ChadTRG42] #7195893
06/12/18 07:21 PM
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Right.

It's neat.


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Re: Brass AR-10 Lower [Re: Mickey Moose] #7195896
06/12/18 07:23 PM
06/12/18 07:23 PM
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cool / unique. i would have probably left it at an 80% lower.


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Re: Brass AR-10 Lower [Re: Mickey Moose] #7195919
06/12/18 07:45 PM
06/12/18 07:45 PM
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BenBrook Texas
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Amazing what can be done with proper tools and knowledge. up



Re: Brass AR-10 Lower [Re: Mickey Moose] #7196006
06/12/18 09:55 PM
06/12/18 09:55 PM
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Mesmerizing. AVe would approve.

Re: Brass AR-10 Lower [Re: GLC] #7196008
06/12/18 09:58 PM
06/12/18 09:58 PM
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Lake Texoma, TX
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Originally Posted By: GLC
Amazing what can be done with proper tools and knowledge. up


cheers

Re: Brass AR-10 Lower [Re: ChadTRG42] #7196601
06/13/18 03:45 PM
06/13/18 03:45 PM
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Texas
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Originally Posted By: ChadTRG42
The reason why brass is used as an ammunition case it because it's malleable. AR-10 brass lower- malleable.


There are aluminum and steel cased ammo options also, so I don't think this argument holds up. My guess is that aluminum is used for uppers/lowers because of its strength to weight ratio, not because it is particularly strong or rigid. It is strong enough for the job, while still being lightweight.

I am certainly no metallurgist, but I don't think you can claim that brass being used in casings means it wouldn't work for a lower. My guess is that brass would be fine to use for lowers function-wise, but isn't typically used because it is much heavier and way more expensive when compared to aluminum. I doubt that a brass lower, with the thickness of material required to form a lower, would be unsafe because it is too "malleable."

Aluminum is used for aluminum foil because it is malleable. Aluminum lower - malleable. See the fallacy here?


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Re: Brass AR-10 Lower [Re: Mickey Moose] #7196647
06/13/18 04:51 PM
06/13/18 04:51 PM
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Wolfe City, TX
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I was thinking brass was strong enough for the job, it's just heavier. But I am no medalurgist either. Just a fabricator/ welder, and wanna be blacksmith and machinist.

Under the right circumstances, this ole boy's materials for his lower could have been 100% free. His manual machine operating skills are quite impressive, in any case.



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Re: Brass AR-10 Lower [Re: Mickey Moose] #7196649
06/13/18 04:54 PM
06/13/18 04:54 PM
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i thought brass and aluminum is actually about the same till you get into 6061 which is slightly harder than brass, then 7075 is even a harder (stronger tensile strength) aluminum. brass has the weight though. here's my thought, i buy a brass no-mar hammer to keep from damaging a steel part when it needs to be hit, the brass gives way before damaging that part, an aluminum hammer wouldn't have the weight i would need. a steel barrel up against a brass receiver on a lever action, i wouldn't own. steel pins in a brass lower to upper may not be as bad but then you have the weight.



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Re: Brass AR-10 Lower [Re: Mickey Moose] #7196660
06/13/18 05:11 PM
06/13/18 05:11 PM
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Grayson County
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Brass-framed blackpowder revolvers stretch under recoil so the loads must be kept light. Why would this lower be any different?

Re: Brass AR-10 Lower [Re: Choctaw] #7196676
06/13/18 05:37 PM
06/13/18 05:37 PM
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Originally Posted By: Choctaw
Brass-framed blackpowder revolvers stretch under recoil so the loads must be kept light. Why would this lower be any different?


to me, the stress points would be key, brass frames/receivers are a big no go for me. i would think the design of the ar upper to lower has lighter stress points between the two so stretch wouldn't be as bad as that revolver, not gonna say stretch wouldn't show up, but maybe just not as bad


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Re: Brass AR-10 Lower [Re: Choctaw] #7196678
06/13/18 05:39 PM
06/13/18 05:39 PM
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Originally Posted By: Choctaw
Brass-framed blackpowder revolvers stretch under recoil so the loads must be kept light. Why would this lower be any different?


The fire and bolt are above it. Really all a lower does is hold buffer tube/stock, trigger group, magazine well, and two pins, each in a sandwich.(I know you know that) Have you seen polymer lowers? And some guys have made 3D printed lowers.

Looks to me like it doesn't have to be as strong as the upper and the barrel.



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Re: Brass AR-10 Lower [Re: spankyttx] #7196681
06/13/18 05:40 PM
06/13/18 05:40 PM
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Wolfe City, TX
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Originally Posted By: spankyttx
Originally Posted By: Choctaw
Brass-framed blackpowder revolvers stretch under recoil so the loads must be kept light. Why would this lower be any different?


to me, the stress points would be key, brass frames/receivers are a big no go for me. i would think the design of the ar upper to lower has lighter stress points between the two so stretch wouldn't be as bad as that revolver, not gonna say stretch wouldn't show up, but maybe just not as bad


Pin through brass, through upper (aluminum) through brass. Contacting the brass in more area. I would like for him to report what happens, if anything, after 1000 rounds.



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Re: Brass AR-10 Lower [Re: Mickey Moose] #7196682
06/13/18 05:44 PM
06/13/18 05:44 PM
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The spring taking most of the recoil compared to the revolvers frame taking the recoil..... confused2

Also, different alloys have different physical, mechanical, and metallurgical properties. Manufacturing processes also affect the physical and mechanical properties. Casting vs. forging vs. rolling vs. extruding etc. These properties can also be changed thru thermal processing (heat and cold).

Just because itís brass or aluminum is still could be either ductile (malleable) or brittle depending on the alloy and what processes it has undergone..... 2cents
I not a metallurgist or engineer but spent several years working with some really great ones.....used to work for ASM International- The Materials Information Society (formality the American Society for Metals)


Originally Posted By: skinnerback
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Re: Brass AR-10 Lower [Re: SnakeWrangler] #7196689
06/13/18 05:53 PM
06/13/18 05:53 PM
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Wolfe City, TX
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Originally Posted By: SnakeWrangler
The spring taking most of the recoil compared to the revolvers frame taking the recoil..... confused2

Also, different alloy have different physical, mechanical, and metallurgical properties. Manufacturing processes also affect the physical and mechanical properties. Casing vs. forging vs. rolling vs. extruding etc. These properties can also be changed thru thermal processing (heat and cold).

Just because itís brass or aluminum is still could be either ductile (malleable) or brittle depending on the alloy and what processes it has undergone..... 2cents
I not a metallurgist or engineer but spent several years working with some really great ones.....used to work for ASM International- The Materials Information Society (formality the American Society for Metals)


Reckon if he he liquid quenched it, it might have become brittle? Looks to me like he just let it slowly air cool (air quench).



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Re: Brass AR-10 Lower [Re: Mickey Moose] #7196695
06/13/18 05:58 PM
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I agree. Extruded billet machined is also very different from cast and machined....be interesting to know the alloy too....


Originally Posted By: skinnerback
Milf does the trick.

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"You Cannot Simultaneously Be Politically Correct And Intellectually Honest!"
Re: Brass AR-10 Lower [Re: Mickey Moose] #7196697
06/13/18 06:01 PM
06/13/18 06:01 PM
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Man has serious skills!


Originally Posted By: skinnerback
Milf does the trick.

"You're statistically more likely to be killed by Hillary Clinton than an NRA member. - PolitiDiva

"You Cannot Simultaneously Be Politically Correct And Intellectually Honest!"
Re: Brass AR-10 Lower [Re: FiremanJG] #7196722
06/13/18 06:32 PM
06/13/18 06:32 PM
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Originally Posted By: FiremanJG
Originally Posted By: Choctaw
Brass-framed blackpowder revolvers stretch under recoil so the loads must be kept light. Why would this lower be any different?


The fire and bolt are above it. Really all a lower does is hold buffer tube/stock, trigger group, magazine well, and two pins, each in a sandwich.(I know you know that) Have you seen polymer lowers? And some guys have made 3D printed lowers.

Looks to me like it doesn't have to be as strong as the upper and the barrel.


Yep, good points. The lower isn't going to have the stress that an upper would. Then again I'm not a gun builder or a metals guy so I'll shut up now. lol

Re: Brass AR-10 Lower [Re: Choctaw] #7196747
06/13/18 07:06 PM
06/13/18 07:06 PM
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Originally Posted By: Choctaw
Originally Posted By: FiremanJG
Originally Posted By: Choctaw
Brass-framed blackpowder revolvers stretch under recoil so the loads must be kept light. Why would this lower be any different?


The fire and bolt are above it. Really all a lower does is hold buffer tube/stock, trigger group, magazine well, and two pins, each in a sandwich.(I know you know that) Have you seen polymer lowers? And some guys have made 3D printed lowers.

Looks to me like it doesn't have to be as strong as the upper and the barrel.


Yep, good points. The lower isn't going to have the stress that an upper would. Then again I'm not a gun builder or a metals guy so I'll shut up now. lol


No, keep going!

Just an education, discussion brudda! cheers



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Re: Brass AR-10 Lower [Re: FiremanJG] #7196752
06/13/18 07:10 PM
06/13/18 07:10 PM
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Originally Posted By: FiremanJG
Originally Posted By: Choctaw
Originally Posted By: FiremanJG
Originally Posted By: Choctaw
Brass-framed blackpowder revolvers stretch under recoil so the loads must be kept light. Why would this lower be any different?


The fire and bolt are above it. Really all a lower does is hold buffer tube/stock, trigger group, magazine well, and two pins, each in a sandwich.(I know you know that) Have you seen polymer lowers? And some guys have made 3D printed lowers.

Looks to me like it doesn't have to be as strong as the upper and the barrel.


Yep, good points. The lower isn't going to have the stress that an upper would. Then again I'm not a gun builder or a metals guy so I'll shut up now. lol


No, keep going!

Just an education, discussion brudda! cheers
cheers


Originally Posted By: skinnerback
Milf does the trick.

"You're statistically more likely to be killed by Hillary Clinton than an NRA member. - PolitiDiva

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Re: Brass AR-10 Lower [Re: Mickey Moose] #7196753
06/13/18 07:10 PM
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felt recoil comes before buffer tube spring action, i see no reduction in recoil from the buffer spring and seems would be a slight increase or prolonged till the felt forward action of the bolt slamming forward into lock


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Re: Brass AR-10 Lower [Re: Mickey Moose] #7196769
06/13/18 07:32 PM
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So you metal guys, tell me about this brass holding up in an AR-10 platform.



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Re: Brass AR-10 Lower [Re: ChadTRG42] #7196789
06/13/18 07:59 PM
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Originally Posted By: ChadTRG42
So you metal guys, tell me about this brass holding up in an AR-10 platform.


to me, it goes without saying, a 10 would be harder on a brass lower and more likely to show wear and tear (stretch as choctaw says) than a 15 would


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Re: Brass AR-10 Lower [Re: Mickey Moose] #7196791
06/13/18 07:59 PM
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I just wish I had that much free time on my hands. Pretty dang cool regardless.

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