Well Folks I am at the end of my 'smithing knowledge. I have a nice 77/22 with an integral suppressor built by Ciener. It has over 15K 22 LR's through it, other than an occasional brush through it, it's never been disassembled. I made a spanner wrench and removed the muzzle end cap. Once inside the muzzle end of the "can" i could see the dirty fouled baffles.
I plugged up the chamber end with an empty case, and standing the bbl on end filled it with Hoppes. Got a few baffles out. More soaking over the next 9 days and they are now all out. What a chore! Nothing damaged so far...(knock on wood).
I believe the barrel is ported somewhere before the muzzle for gas bleed off. The barrel itself seems to be a bull bbl configuration. The barrel is encased by a steel sleeve approx .050" thick. There is a set screw (which I removed) in front of the mounting "wedge?".
I would like to remove this sleeve, any ideas for further cleaning. I have gotten the bbl cold (it was -10 here last night) by leaving it outside all night. I brought it inside and warmed up the chamber area of the sleeve with a heat gun, nothing too severe. I thought maybe the sleeve was threaded on and the set screw was for timing. nothing doing. I used a piece of brass stock as a punch and tried to drive the bbl off of the sleeve by tapping, hard, on the mounting wedge, Nope. I will try to post a couple pics of the mounting wedge, baffles, and interior of the can after removing all 12 baffles and a small expansion chamber.
I can't get pics uploaded, so I will just post the script for now. I will keep trying on the photos, meanwhile, talk amongst yourselves...