From the pictures, you may have noticed that the primer of the gun was removed. As this is a bolt action modification, my goal is to make the gun prime with a bolt, just like a loser rifle. The problem is, i don't know what materials to use as the bolt and how to keep it stable and such.
A suggestion; drill a 3.5 mm hole (use google to translate to metric, and round numbers for ease) through both sides of the pump slide as far forward as you can, making sure that the holes are in line with the slit in the shell.. Then thread a 4 mm galvanized threaded rod through the hole. The friction should be sufficient to hold it in place, but epoxy is great for assurance. Then thread 3 (4mm) nuts along the rod on each side as far as you can. They should be tight. Cut off the rod 1mm after the last nut on each side, then epoxy the nuts in place using that gap. Take the bolts from a Longshot, Longstrike or Vulcan and epoxy putty then in place over the nuts and bolt. You now have a secure bolt action gun.
Keep in mind that any attachment you add cannot increase accuracy or performance, and any perception to that effect is wishful thinking. Bolt action is awful, and will never be as good as pump action on any blaster. As has been said, use Coop772's method and you'll have a tacticool weapon that actually works in a war. Kudos for the creative thought though.
Alternatively you could just hot glue some Longshot, Longstrike or Vulcan bolts to the side of the slide. That would be just as good, but probably not permanent.
I've always wanted to be a pilot. Then I'll have an excuse to keep my head in the clouds.