ACE 7 position Stock with HD tube

[Roughneck12]

I bought one of these stocks and tube combos and the instructions say that I can adjust some slop out by removing the stock from the tube and useing a screw provided. Thats cool. But for the life of me I can't figure out how to remove the stock from the tube.

Can anyone tell me how to do this?

 

[ESQ]

Don't know about ACE stocks, but every other stock I have handled, you have to pull the adjustment tab down away from the stock (as opposed to pressing in the lever, which only lifts the pin out a bit) when the stock is at its most rearward travel and it comes right off.