These are the parts you need to make the little "sight" on the barrel of your Han Solo Blaster DL-44.
The little antenna looking things originally came from an Avron model airplane kit. We've patterned ours precisely from the originals and had them injection molded the same way.
The "T" shaped bar was perhaps a piece of cabinet sliding door track, although to my knowledge no one has produced an original piece of the material to confirm that. But assuming it was sliding door track, we had ours extruded from PVC, which is likely the original material.
You will need to provide your own adhesive to mount these to your blaster.