This stock was on an Armalite AR-10 that I bought used so I'm not sure which particular version it is. It should fit both AR-10 and AR-15 rifles with A2 receiver extension tubes.
- Inner diameter: ~1.14-1.15" (as measured by my digital calipers)
- Overall length (minus pad): 9.9"
- Pad is 1/2" at the thinnest
- No receiver extension included
