take 4 blue rods and attatch them skipping spaces around 5 white snowflakes, but put an orange connector 2 snowflakes in to act as a block trigger. then build a standard white snowflake/orange connector barrel 5 layers thick and a yellow rod long, attatch them together and you may need to mod to attatch to your gun. but to fire, just use a black/grey rod for firing pin and load in random junk (the debris at the bottom of a knex box works well here) or you can load in marbles, rods, and many other things.
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They're all bad really, it's just an excuse to post block triggers. Besides, they are totally not needed on a knex gun. The only under barrel mounted grenade launcher I think is half decent and the exception to what I said above is the one on The Jamalam's storm 223, to actually answer your question.