You can adjust the trigger with a 2.5mm allen wrench by inserting it through a small hole in the magazine well but it's kind of awkward. I just take the barreled action out of the stock to give it a good initial cleaning and oiling anyway and the adjustment screw is easy to get to. Counterclockwise decreases pull weight, clockwise increases it. Another large nut is in the way and limits how far you can turn it out.
Full instructions for disassembly and reassembly, trigger adjustment, replacement of pistol grip and adding butt pad spacers, all of that is in the owner's manual. They even give you the torque specs for various screws - 44 inch/pounds on the two action screws for rifles with a plastic trigger guard.
