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April 14, 2018, 04:10 PM
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#1 |
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Member
Join Date: February 28, 2017
Posts: 55
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Aluminum PA-10 lowers
Hey guys, those PA-10s right here
http://palmettostatearmory.com/psa-g...-77932912.html I don't know very much about the AR-10/PA-10 platform but I know I want to have one (potentially in 6.5 Creedmoor)... I was wondering about aluminum. Is aluminum strong enough for 308/6.5? Obviously it is since most of them seem to be made out of aluminum, but... i always thought of aluminum as rather soft... Metallurgy isn't my strong suit, and its not like there is a 'material strength for dummies' out there... |
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April 14, 2018, 07:47 PM
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#2 |
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Junior member
Join Date: February 2, 2010
Posts: 6,846
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Is there an option and if there is, why would you tote the extra weight?
The lower is basically a "non-stressed" component which simply supports the upper and holds the FCG in position. |
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April 14, 2018, 08:11 PM
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#3 |
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Member
Join Date: February 28, 2017
Posts: 55
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good point, thanks!
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April 15, 2018, 12:17 PM
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#4 |
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Senior Member
Join Date: February 17, 2009
Posts: 1,089
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And... remember the Original AR10's used aluminum as well... Aluminum is a perfect choice for AR based platforms even up to VERY large caliber / abusive variants.
Buy with confidence from PSA.... their updated Unlimited Lifetime warranty is a huge bonus. BTW... here are links to my most current updated reviews of the PSA .308 GenII and the 6.5CM upper.. https://www.ar15.com/forums/industry...7-/301-284190/ https://www.ar15.com/forums/industry...s-/301-285762/ IMHO... they are GTG, and all at a price and value us working folks can afford. |
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April 15, 2018, 09:40 PM
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#5 |
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Senior Member
Join Date: November 5, 2016
Location: DFW, TX
Posts: 1,147
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I was wondering about aluminum. Is aluminum strong enough for 308/6.5? Obviously it is since most of them seem to be made out of aluminum, but... i always thought of aluminum as rather soft... Metallurgy isn't my strong suit, and its not like there is a 'material strength for dummies' out there...
Other than polymer, carbon reinforce and stainless steel (are they still available?), aluminum is the only material available. Certainly the most common. But which aluminum? 6061 or 7075 are both aluminum alloys. Each has its pros and cons. Take your pick. For a recreational shooter, it probably won't matter anyway. Pick whatever catches you eye and fits your budget. But when it comes to an AR10, stay with the same manufacture for the upper and lower receiver and parts (except BCG and triggers) to guard against compatibility issues. 6061 – MECHANICAL PROPERTIES: Ultimate Tensile Strength 45000 psi Tensile Yield Strength 40000 psi Fatigue Strength 14000 psi Shear Strength 30000 psi Hardness, Rockwell 40 Machinability 50% 7075 – MECHANICAL PROPERTIES: Ultimate Tensile Strength 83000 psi Tensile Yield Strength 73000 psi Fatigue Strength 23000 psi Shear Strength 48000 psi Hardness, Rockwell 53.5 Machinability 70% |
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April 16, 2018, 09:42 AM
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#6 |
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Senior Member
Join Date: January 26, 2008
Location: Madison, AL
Posts: 1,932
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Konstan, I felt the same way about AR10s. I wanted one but didn't know much about them. After doing some research I ended up buying a 6.5 Grendel for the AR-15 platform. You may consider this option because they are lighter guns, have fantastic ballistics (but not as good at 308/6.5C), are cheaper and because it's AR-15 you don't run into the lack of mil-spec standards. Having to figure out which parts fit with others was the main reason I didn't go AR-10 route.
If you want the AR-10 I'm not trying to talk you out of it. I just wanted to relay my experience. I agree with Mobuck though, aluminum is sufficient because it's supporting the upper, not containing the percussion of the round being fired. |
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