Hi!
I have been recently working on Sternguard Veterans and I needed some combi weapons so... I decided to convert some. I used a very simple technique and the result looks pretty good (at least I hope so) so I decided to share
Needed: 1 Bolter, 1 Plasma Pistol, Tools (hobby knife, files, plastic glue)
1) Take a regular bolter and plasma pistol. Cut off the hand holding the p-pistol.
2) Bolter: Cut off the part marines usually hold in their hand, as seen on the picture. Be careful when cutting as you may easily damage the clip, which we are not going to remove. Cut off the gun barrel as well.
Plasma pistol: Split the pistol in two parts, as seen in the picture. Basically you want to get rid of the cooler-like looking part and its surrounding area.
3) Again we are going to cut the plasma pistol in half, or what has left of it. This time we need the part with the larger gun-barrel. Ever noticed those little cooling holes on the front of the pistol? You want to cut it in such a way that the piece will have three of these holes on each side - see the picture.
4) File the cutted areas and glue the pieces together. Don't forget on the bolter gun barrel! Be careful with the glue as any excess glue may damage the details of the model!
Here is the final result (sorry, I forgot to take the final unpainted picture, but this should be good enough):
Size comparison to the combi-plasma from the commander box:
As you can see, the weapon is pretty compact, so it should be compatible with most of those classical marine poses you can do with the generic marine arms.
Thanks for reading! Comments and criticism is most welcome