It's an easy swap, I just had my 500 apart to refinish the stock. Remove the recoil pad, just squeeze a #2 phillips head screwdriver in the little holes in the back of the recoil pad and take it off. The stock itself is held on with a slotted screw, you'll need a long common screwdriver to reach the screw head. As far as the forearm goes you'll have to remove the forearm/slide assembly from the gun. If you look at the front of your forearm you can see a ring of steel that holds the wood on the assembly. It's nothing but a big nut, you can see two slots on the front edge of the steel nut. You just need something flat that fits into the slots that's able to span the width and so that it's in both slots at once. I used the back edge of a butter knife to take mine apart.