[FreedomCalls]

Here's another very similar cane-type gun:

[Sacajaweau]

Interesting. Everything looks threaded.

The neck bomb and gun looks like there are welds and there are a lot of shims on the collar. The 4 tumbler locks on the collar and what looks like a briefcase lock also make me think of a junkyard.

Again, the guy doesn't care about the "finished look" of his product, just its' capability. Obviously, the collar worked.