The Blargo missiles are in NpcMaze.bmp
You'll need to move them to another sprite sheet and then have npc.tbl read off them. I recommend plugging them in Loading.bmp, ArmsImage.bmp, StageImage.bmp, PIXEL.bmp, or CREDIT01.bmp. Here's where you can change the render settings in the npc.tbl file for them.
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The Balrog Missile entity number is #170.
This may help.Can you double qoutes sprite size?