Kamcha whipgun?

[archer]

Hi,
The "T' section at the very end likely cocks the firing pin. when that is pulled out the folding trigger can drop down. It may have had something to grab the cross pin to aid in cocking . Look up Cane guns and see how they operate. Likely the barrel and receiver twist and pull apart enough to put in and take out a shell.
If it is Black powder then the metal bar in the middle is a hammer rather that a trigger and the barrel would not come apart and the "t" thing at the end becomes the trigger. Step one take a dowel and see how far it goes it the barrel it maybe loaded if so see a gunsmith. The areas we've discussed seem to be all metal and away from the fabric, if so try break free, etc.
Hope this helps, Steve

P.S. Tread carefully if your in USA Cartridge Cane guns require BTAF Tax approval, not sure on Black powder versions. I had a .410 cartridge cane confiscated by them. See second photo yours just doesn't have a pistol grip.