FX Fx Bobcat Mkll

Hi All ,
New to the site and to pcp airguns.
I inherited 3 Pcp’s one being a bobcat mkll .30. I have been researching replacing o-rings so I started taking apart air tube and removing two screws from bottom of stock but can not remove stock , it will not budge. From wht I’ve read it should lift straight out. Any help would be appreciated.
 
Fortunately, during the short time I have owned my Bobcat MK1, I have had 0 issues. I bought the kit as a proactive measure. The consensus is that the MK1 is not the easiest air gun to work on. I think if you are careful around the piping, you will be fine. Speaking of Bobcats, mine is going up for sale to finance my EVO. Check it out in the classifieds shortly.