These photos were taken at the Star Wars: Where Science Meets Imagination Exhibit.
A new version of Boba Fett's BlasTech Industries EE-3 Blaster Rifle was created for Return of the Jedi. This Blaster Rifle is often referred to as the RotJ Rifle or simply the RotJ EE-3.
The Return of the Jedi Boba Fett Blaster Rifle is still based on the Webley No 1 Mark 'I' Flare Gun. A new barrel was added over the Webley with cabinet T-Track laid down its length. The barrel appears to be an unidentified found part, similar to the shaft of a jackhammer. Part Nos. 97 and 98 (Triple Ejector Rack) from a 1/32 Revell F-4E Phantom II model was used on both sides of the Webley to cover the engraved stamp (the one that reads "Webley & Scott MK I 1916). An ASI 4X20 Scope was used again for this blaster, but flipped 180 degrees from when it was used on the Empire Strikes Back Boba Fett Blaster Rifle. On the stock is a part from the 1977 Revell Visible V8 Model Engine, Part No. 92 (cover, starter gear case), and another unidentified plate cover. One of each was glued to both sides of the stock. There are also two Philips-head screws that were screwed into the butt end of the stock, one at the top, the other at the bottom.
Unlike the Empire Strikes Back Boba Fett Blaster Rifle, the Return of the Jedi Boba Fett Blaster Rifle is a resin casting. In addition to the resin cast "hero" blaster rifle, several foam rubber stunt blaster rifles were created.