Will a AR15 gas block work on a AR10?

[tiger222]

Dumb question of the day ~

Assuming barrel diameters are the same, will a AR15
gas block work on a AR10 style rifle, (or rather would the AR10
function).

For some reason I have in the back of my head that
the AR10 gas tube is a slightly larger diameter....

TIA

[AlohaRover]

Armalite, RRA, and DPMS 308 gas tubes are the same outer diameter as an AR 15, so yes you can use the AR15 gas block.

[ar15barrels]

Assuming barrel diameters are the same, will a AR15
gas block work on a AR10 style rifle

Yes.

Barrel diameters are quite often not the same though.

AR-15 and 308 type AR barrels hve been observed to have gas block diamters as follows:

0.625
0.750
0.812
0.875
0.907
0.937

0.750 is by-far the most common size
Bull barrels are usually 0.937
AR-10T barrels are 0.875
Alexander Arms barrels are often 0.907

[ar15barrels]

Armalite, RRA, and DPMS 308 gas tubes are the same outer diameter as an AR 15, so yes you can use the AR15 gas block.

Gas tube lengths vary though.
Armalite AR-10's use a different length gas tube than AR-15's.

308 AR's also need a gas tube with more bend as the receiver is taller and that puts the gas key further up from the barrel's centerline.