The only model I know of is the old metal Catachan missle launcher trooper. But converting the plastics is easiest...new Cadian heavy weapon teams seem to be the way to go. Find out which sprue you need by calling GW mail order.
The IG standard plastic trooper would be the best thing.
It's a bit of converting for each model though.
With example in a catachan you would need to at least cut off one of the legs and further sever both the legs at the knee joint, then it's just to reposition them into what fits you best...
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