Ar-10 bbl question

[krw]

I have a POF, P-308 AR. It has 16” 308 bbl. I want to change to a 20” 6.5CM bbl. I know there are 2 patterns of AR uppers. My question, do all AR-10 barrels interchange?
Would like to have a complete upper but cannot find one like I have on now. Thks

 

[Kickin45]

The DPMS pattern barrel extension is the most common. This translates into many 308 AR barrel options. RRA LAR 308 will also work with a DPMS barrel.
The Armalite AR-10 barrel extension is not dimensionally identical to the DPMS.
Therefore Armalite AR-10 rifles must use barrels designated for the Armalite AR-10 and vice versa.

 

[krw]

So which style is my POF?

 

[simonp]

Just to tag on to OP's question, any idea which style SIG AR-10 uppers use for their barrels, like to replace the SIG barrel on mine.

 

[Cr1775]

Just to tag on to OP's question, any idea which style SIG AR-10 uppers use for their barrels, like to replace the SIG barrel on mine.

If the upper is rounded it's Armalite , if it's slanted it's DPMS.

 

[bpd459]

You have it backwards. Stoner, Armalite are slanted / straight angle AERO, DPMS are rounded.

 

[Cr1775]

Thank you my mistake.

 

[Ex E6]

So which style is my POF?

DPMS .

 

[LuckyLuke80]

Also, just to muddy the waters, I have a diamondback db10 and it’s the dpms style, but is slanted. From my limited experience the majority of ar10’s are dpms pattern.

 

[Kickin45]

Armalite AR-10 barrel nut threads are 1-7/16” and 18 TPI-3A
DPMS pattern barrel nut threads are 1-7/16” and 16 TPI- 2A

 

[bfoosh006]

I would phone POF, and ask them prior to any barrel purchase...
https://www.snipershide.com/shooting/threads/pof-upper-308-compatible-barrels.77064/

 

[krw]

Thank You!!