I'm posting this from FISD for reference:
Looking at the length of the mag clip, these look to be based on Shawn Morgan's version! Look at the photos below. On the 'real' prop, I believe the barrel to be a bit smaller, the mag shorter and the bit on the underside of the rear of the barrel to be sticking out less than Shawn's. Also there appears to be a horizontal split in the handgrip panel level with the forward switch detail. I think that Shawn's side barrel buttons are a bit on the low side too. I know that there is the potential for distortion in photos, so I'm happy to put it down to that. Shawn's SE-14R captured the spirit of the blaster exceptionally well so I'm not going to quibble! I really love mine!
Just scanned these from the Visual Dictionary:
Other images: