Finally, i have my proof.
This isn't complete, it's just the rough mech...
Model 1887? That's what it was supposed to be in the first place, but alas, it was too bulky.
This is not modeled on a specific lever action rifle/shotgun, it's just a true lever action.
This will have a static (intergrated, non-removable) magazine. I'll post the whole thing when i'm finished.