Another good alternative is
SM scout shotguns. I had plenty of those spare so my melta vets also picked up 7 shotguns. With the
SM shotguns you'll need to trim off the hand the holds the gun underneath, and then cut the trigger off. Get an
IG lasgun arm and remove the lasgun then attach the shotgun in its place. Use one of the
IG heavy weapon left arms to support the shotgun. I used a few of the different left arms for different poses. Some general
WIP stuff of that can be found
Here (WIP1)
http://nftrc.blogspot.com/2010/08/ig-backpacks-wip.html
Here (WIP2)
http://nftrc.blogspot.com/2010/08/ig-veterans-wip-2.html
and here (about finished)
http://nftrc.blogspot.com/2010/08/ig-veterens-done-mostly.html