Thinking aloud.
My lad could use a better shroud on his rifle.
I can buy 1m of carbon tube, have it delivered through the post. I make a couple of bushes, fill it with hair curlers and pan scrubbers.
Non of the above are individualy gun parts.
Once assembled and the intention is to fit to a gun, does it then become a gun part and cannot be posted ( except parcelforce 48) .
If I then break it down back into component parts to post, am I posting hair curlers or moderator parts.
Just thoughts.