Anyone have any experience with disassembly of the Sig Super Target?

[wadetsmith]

Mine just stopped firing, it's charged, but the trigger will not release or something. This makes it I would think not a very safe thing to try to disassemble, but I may have to try. It's quite a few years old now and thousands of rounds but it's been solid 'til this. No warning, just, pumped it up and nada.