The Stasis Rifle is a tool that will fire an energy pulse that generates a stasis orb upon conatct with a creature, item, or solid surface which will cause items within the generated orb to be momentarily frozen and unable to move. The Stasis Rifle can be crafted with the Fabricator and will take up four slots in your Inventory, it requires a Battery to operate. If its Battery is used up you can replace it by pressing R.
To find the Stasis Rifle Fragments head north from Lifepod 3. After a bit the seafloor bottoms out. The floating Islands are about 100-200 meters down. You should see the wreck resting on the second or third you run across. It has two entries: a closed door on one side, an open doorway in some wreckage on the other. Go in through the closed door.
It is advised that you take the cutting tool as this wreck has some good items to scan.
The video below will show you the location of the Stasis Rifle Fragments.