First Ar-10 build

Tgself1

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Minuteman
Apr 7, 2022
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Athens, Georgia
Good evening, I am brand new to the forum and need a little advice/recommendations. I have built several Ar-15 rifles, but I am currently trying to build an Ar-10. I bought a PSA PA-10 gen II completed lowering sale a while back, but by the time I had the funds to build the upper they had discontinued the gen II receivers. I want to just get a stripped upper so I can build it and customize it. I know there isn’t a whole lot of compatibility between different brands in the AR-10 market, so my question is does anyone here know of any other upper receiver brands that would work on a PA- 10 lower or do I need to just start completely over?
 

msgriff

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Feb 10, 2021
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Rogue Valley OR
PSA PA-10 is technically a unique pattern. No other upper manufacturer has been a reliable match that I've heard of. Bore alignment is the biggest issue. The PA-10 gen 3 upper will work with a gen 2 lower, but there are cosmetic differences.
 
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mtrmn

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  • Oct 7, 2009
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    I believe PSA has a blog or forum linked on their site that probably has some answers but you'll have to do a lot of reading. Also they will answer your questions directly about compatibility between generations of their products, don't know about other companies' products.
     

    CaptArab

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    I'd get an aero M5 builders set with receivers and hand guard, then browse the forum classifieds for the rest.
     

    Steve_In_29

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  • Jul 22, 2020
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    As was posted, the Gen3 PA-10 uppers WILL work with your Gen2 lower.

    If you want to start over I would say get the Aero M5E1 receiver set.
     
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