My approach for this prop was very similar to how I did my Jim Raynor pistol. Lots of MDF and foam PVC was used. The only differences were that I did not make a mold of this and the cylinder actually spins!
I started with my own custom design and cut the base shape out of MDF. I took elements of the design from the Raynor gun, real guns and revolvers from the video game Borderlands.
Some of the MDF pieces were made separately and attached to the main body of the revolver.
The cylinder was designed to spin freely so I put a dowel through the middle of it. The thing on the bottom of the barrel is PVC pipe with a dowel through it as well. The ends were plugged up with magic sculpt and then sanded smooth.
I had to make separate pieces for inserting the spinning cylinder. The dowel from the cylinder will rest in these inserts when they are glued into place.
Details for the revolver were cut out of some spare foam PVC that I had around. The handle was carved with my Dremel tool.
With all of the detail work done the entire thing was primed, sanded and sprayed with a dark brown matte paint.
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