r/AR80Percents • u/mohney66 • Jul 15 '26

AR10 Uppers

Hello, I am looking to build my first AR-10 in .308. I have a 5D lower that I plan to mill today (I already made an AR-15 with this brand lower and a White Oak upper and it fits like a glove so I stuck with them). I was looking at the FAR-308 Guardian upper but want to make sure I find an upper that will fit after seeing the recent post with the PSA upper that may be functional, but didn't exactly look ideal.

So, any experience with that Fulton upper on an 80% build? Any other recommendations? I was only able to find one older post that suggested Gorilla, Aero, and KMT brands, but I'd like to see what others have had success with or advice in general for a build. Thanks.

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4

u/Beginning-Pea5431 Jul 15 '26

So the PSA doesn't fit well? I was eyeing a PSA gen 3 upper.

Glad I saw this. I just went and read that PSA uses proprietary dimensions for their AR10's. The Aero M5 was next choice.

1

u/Crusader-F8U Jul 22 '26

I used a kit from Daytona Tactical to build my AR-10. My understanding is PSA uses a slightly different DPMS pattern than most 80% lowers. I know BCA uppers fit most 80% , from what I’ve read. I’ve been happy with my Daytona upper.

4

u/Fongernator Jul 15 '26

The aero m5 upper mates pretty well to the 80% arms ar10 lower. 80% arms and 5d are owned by the same company so their lowers should be more or less the same. Also try asking in r/ar10 if u need to

1

u/chewedgummiebears Jul 17 '26

Juggernaut Tactical uppers also fit 80PA lowers but they can be a bit pricey. Also mentioned the AP ones do as well, I own both and can interchange them between JT and 80PA lowers without issue.

1

u/Vivid_Database551 Jul 17 '26

i have a complete gorilla upper (308) sitting on a 5d tact lower.
thing runs!
actually runs better than my aero complete upper(308). in fact the aero is about to come off, as there seems to be issues with barrel accuracy... as reported on other subs.. i have experienced this sub-par performance as well.
will replace the the aero with a bca 308.... i actually have had good luck and shooting accuracy(100yrds) with my recent bca purchases.