For a semi, once you want to get rid of it, ram a file down the barrel, take a hammer to the extractor, file the surface of the fireing pin, field strip the gun

For a semi, once you want to get rid of it, ram a file down the barrel, take a hammer to the extractor, file the surface of the fireing pin, field strip the gun and toss it in different places (preferably in salt water). That sounds like a lot of work, but without disposal it takes like 10 minutes. For a revolver, you slam a file down the barrel, forcing cone, file the striking surface and the chamber, take that apart and ditch it separately (again in salty water). Even if they manage the find all the parts, they will never be able to match up ballistics. And hey, somebody stole your gun, you have no idea why they would do all that.