I have been buying cheap gun cases on line from Amazon or Walmart. They run under $20 shipped and come in their own cardboard box. Put the gun in the case and the case in the box, pull the old shipping label off or tape over it and you have an excellent shipping container that's almost bulletproof. I've shipped a bunch of higher end guns that way and never had one damaged.
Order a cheap plastic case from Amazon. They ship it to you in a perfect size box. Put the gun in the case, zip tie case shut, back in the box, tape it up and ship it.
This, too. I will break down the long gun and order a shorter case.
Regards,
deadlift_dude “The very first essential for success is a perpetually constant and regular employment of violence.” ----Fred Rogers
