If you don't have a hard case, I often buy the thicker pool noodles instead of bubble wrap.
If you wrap everything in paper, you can slice the noodles lengthwise and slip the barrels inside and tape them in place. You can do the same with a stock / receiver by wrapping it around the perimeter and taping in place.
The high density foam works well in suspending parts in foam when thrown around in shipping. I've used them many times in shipping heavy propeller blades without issue as well.
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