I do not know the Marlin 90 so I do not know if you really need thin walls or not. If not, then I would recommend you call Mike Orlon and ask him. He will know if he can put regular thickness screw ins in your gun, is much less expensive then Briley, has you barrel for a shorter period of time and if you are a member of www.ShotgunWorld.com, you give him your screen name and get 20 percent off.
I have some Briley thin walls and clean them in the barrel and then unscrew them and wipe them off on the outside and clean the threads and then re-install. I have friends that will not use Briley thin walls, since, like noted, they can be damaged if handled poorly outside the barrel, but handled correctly they are fine by me. \
_________________ Robert Kittine
Sag Harbor and Manhattan, New York
16 Gauge O/U Browning 525 Sporting
16 Gauge SxS Dickinson Estate (Soon I Hope)
16 Gauge Pump Browning BPS Upland
16 Gauge Semi-AutoRemington 1100 Sporting
Single Shot ???
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