OK, if there is no screw then the forend just pulls away from the receiver or has some obvious catch mechanism you should be able to see. Either way, the forearm must be removed to remove the barrel.
As to drifting out other pins and parts coming loose, sounds like you are on your way to what we call a "gun-in-the-bag." Just remember that bench-time usually runs about $50/hr. (We get $60/hr, here.) I guess you could say that your gun IS gunsmith-friendly...
The autonomic nervous system provides for involuntary muscle function - the work of breathing, digestion, and so forth. On some folks, that's a pure waste of ingenuity.