There is a steel tool that spans the gap between the driving slots on the forearm retaining ring.
HOWEVER, a paddle wood bit (forgot if it is 1 1/8" or 1 /1/4") will drop into the front of the handguard and spans the gap of the retaining rings PERFECTLY and can be used to take off the wood hand grip without damage to the forearm.
You can take the completed forearm (including the action bars) to nearly any hardware store.
Look at the bits and you will see the right size that drops down the front of the forearm. (again either 1 1/8" or 1 1/4" sorry my brain has faded!)
Simple
"Hill Billy Gunsmithing" but it
WORKS!Give it a try.
If you need the tool, I have one I'll loan you if you are up for postage there and back!
B.T.W. to remove the forearm, take off bbl, take out mag spring and follower.
Flip over shotgun, and press on the right and left
shell stops (not on the action bar legs! (The shell stops are inside the receiver - these are the "nubs" that fit to both sides of the magazine tube - just press in on each side and the assembly will move forward bit and bit until free) and the forearm will then slide forward and off. Be sure to catch your bolt and carrier as they will drop downward due to gravity.
E-Mail me if you need the tool!
BIGGER_HAMMER