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Max Online: 16728 @ 03/25/12 08:51 AM
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#7195848 - 06/12/18 01:25 PM Brass AR-10 Lower
Mickey Moose Offline
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#7195849 - 06/12/18 01:27 PM Re: Brass AR-10 Lower [Re: Mickey Moose]
ChadTRG42 Offline
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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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#7195893 - 06/12/18 02:21 PM Re: Brass AR-10 Lower [Re: ChadTRG42]
Mickey Moose Offline
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Right.

It's neat.
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#7195896 - 06/12/18 02:23 PM Re: Brass AR-10 Lower [Re: Mickey Moose]
TXGUNNER308 Online   content
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Registered: 12/02/09
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Loc: Farmers Branch / Carrollton
cool / unique. i would have probably left it at an 80% lower.
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#7195919 - 06/12/18 02:45 PM Re: Brass AR-10 Lower [Re: Mickey Moose]
GLC Offline


Registered: 02/25/09
Posts: 5118
Loc: BenBrook Texas
Amazing what can be done with proper tools and knowledge. up
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#7196006 - 06/12/18 04:55 PM Re: Brass AR-10 Lower [Re: Mickey Moose]
Classic Rocks Offline
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Registered: 09/18/12
Posts: 1924
Mesmerizing. AVe would approve.

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#7196008 - 06/12/18 04:58 PM Re: Brass AR-10 Lower [Re: GLC]
2Beez Offline
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Registered: 07/17/15
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Loc: Lake Texoma, TX
Originally Posted By: GLC
Amazing what can be done with proper tools and knowledge. up


cheers

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#7196601 - 06/13/18 10:45 AM Re: Brass AR-10 Lower [Re: ChadTRG42]
TTUhunter4 Offline
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Registered: 07/03/10
Posts: 741
Loc: Texas
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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#7196647 - 06/13/18 11:51 AM Re: Brass AR-10 Lower [Re: Mickey Moose]
FiremanJG Offline
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Registered: 12/16/08
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Loc: Wolfe City, TX
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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#7196649 - 06/13/18 11:54 AM Re: Brass AR-10 Lower [Re: Mickey Moose]
spankyttx Online   content
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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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#7196660 - 06/13/18 12:11 PM Re: Brass AR-10 Lower [Re: Mickey Moose]
Choctaw Offline
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Registered: 11/13/04
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Loc: Grayson County
Brass-framed blackpowder revolvers stretch under recoil so the loads must be kept light. Why would this lower be any different?

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#7196676 - 06/13/18 12:37 PM Re: Brass AR-10 Lower [Re: Choctaw]
spankyttx Online   content
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Registered: 03/05/17
Posts: 167
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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#7196678 - 06/13/18 12:39 PM Re: Brass AR-10 Lower [Re: Choctaw]
FiremanJG Offline
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Registered: 12/16/08
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Loc: Wolfe City, TX
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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#7196681 - 06/13/18 12:40 PM Re: Brass AR-10 Lower [Re: spankyttx]
FiremanJG Offline
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Registered: 12/16/08
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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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#7196682 - 06/13/18 12:44 PM Re: Brass AR-10 Lower [Re: Mickey Moose]
SnakeWrangler Online   content
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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)
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