I have refrained from responding because I have wracked my brain trying to remember what if any maintenence beyond clearing gas ports, carbon removal, and relube we ever did on these models over the 10 years or so in the immediate family we had three in use. Besides the cursory forearm disassembly I don't recall any complete disassembly, nor do I feel it's necessary, this side of a high volume Argentine dove shoot. My question would be why do you want to do it? Is the gun not cycling properly? We now have next generation Browning's Evolve and Gold Fusion, both of which are nice shooters, but by comparison, at least for me very difficult to refit barrel and forearm assemblies after cleaning, everything has to be just so, and even then requires some pressure, more than you would expect. The clone Winchester SX2 is the same way. Unfortunately for me, I shoot these models better than any other gun, which devils me due to the fact that I have a really nice collection of vintage doubles and desperately want to be that good with any one of those!