Gate PTX shotshell adapter

Converts the mag so it can use 30rd shotshells. The PTX mag insert is just wide enough to fit a shotshell, so far only tested with a CYMA shotgun shell with the sticker wrapping removed.

Hardware needed:
[2x] - 4mm spring (can be salvaged from ballpens)
1 for the shellrelease (cut to length)
1 for the shellejector
[1x] - M5 grubscrew for plugging the top
[1x] - small 1mm o-ring for preventing bbs dropping out of the tube
[1x] - 1-1.5 x 15 mm wire (you can use a paperclip) for keeping the shell release in place