I took the plunge today and sent off a Form 1 for a cane gun. I am going to build a hinged breech with a double action only trigger. The trigger will fold up into the cane. To fire it, fold the trigger down, I will use an inertia firing pin, it will be in .410. Once I get the approved form 1 back, I will start a new thread.
Sent 4 other form 1s off today, my stamp collection just keeps growing.