Originally Posted by rickystl
I notice the tube tapers with the comb of the butt stock. Does the hole run full length ? Or just a short distance ?
No, the hole goes approx 2" into the tube, and if you look at the top view pic above, you will see that there are 3 pins down thru the top of the tube holding it to the stock.
If the hollow tube is to hold some sort of sighting device (as suggested above) then 2" should be sufficient for this purpose.