Do close ups of every item with a peace of paper by each one saying your acount name and today's date.
Sell the marker with the hopper, stock, red dot, both barrels and sock for £130 - £150. And sell the rest of the stuff, the tank, mask, pack, gloves and squigey for £50 - £80. Keep all the items on the same Topic so then if some one wants to buy just one thing then you can do that. Sell the whole lot for £170 - £200