Check the FAQ's there is some links with pics and explanations there.
Generally the forend is where the "action" is.
Making adjustments there will most effect how consistently your handi shoots. That is why when a poster asks about accuracy problems, one of the first things we ask and suggest is removing the forend and shooting followed by, how where are you resting that forarm. Rest as close to the "hinge" as possible and remove the forend to "test".
Relieving any errant pressure points along the forend is a good place to start. It can be done with a 1" dowel and sand paper or the excellent barrel bedding tools available on line form GBO sponsors.
A simple "O" ring slid over the barrel stud before the forend is attached will also do this. I have found better results with neoprene washers on that same stud.
Another something to look at is just how "tite" is that forend to the frame. I find that a bit less pressure is better than too much. I relieve it with a judicious filing of the forend bolt hole. but go slow as you do NOT NEED TO REMOVE MUCH.
Finally as Tim already mentioned, that forend screw. It should be consistently tightened as all things gun related for accuracy, CONSISTANCY is key. Use of a torque wrench may proove most accurate. (Pun intended.
)
I hope this and the FAQ's help. let us know.
CW