There are two screws on the bottom of the stock you have to loosen up in order to disassemble the upper receiver from the stock. Then the barrel should unscrew from the receiver. Here is an in depth guide.
Had this issue, had to dissemble the actual stock to get to the receiver and had to realign the screws as they were slightly off centered which prevented being able to unscrew while the entire gun was together.
A forum community dedicated to Airsoft Sniper firearm owners and enthusiasts. Come join the discussion about optics, gunsmithing, styles, reviews, accessories, classifieds, and more!