Seated soldiers shooting or ready shoot while seated

I had to do what Gerald is describing with the horrific Coree 1/35 USMC IWO JIMA set.

NOTHING fit on that kit and I had to make all those hands, arms, legs, torsos and feet fit the rocky base and the flagpole.  I used wire and putty to mount it all up and fill the gaps. 

You may not find a specific kit but most figures can be positioned by cutting them apart and repositioning their body parts in the desired positions. I use thin wire in the joints, position them and then fill the gaps with putty. A little filing and shaping and you have the figures in the posed in the positions you want them in.