It's like a very compact metal crossbow. [As he's speaking, Rocket pours a little of the powder into his hand and lays it out on a large, slightly flat-topped boulder, feeling around for his flint sparker.]
And it fires small, rounded arrow-heads loaded with powder at a speed you can barely see when you pull the trigger. As far as I can tell it uses a small, contained explosion to fire them that fast, and this is the stuff that makes the magic happen.
[He uses his sparker to light the powder, quickly jumping back with an almost manic grin on his face. In a flash, the tiny collection of powder goes up in flames that rise up off the stone about 6 inches with no wood or fuel in sight. The flare-up only lasts 3 or 4 seconds and leaves behind nothing but black powder ash and scorched stone. He looks to Billie, clearly expecting her to be as impressed as he was.]
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And it fires small, rounded arrow-heads loaded with powder at a speed you can barely see when you pull the trigger. As far as I can tell it uses a small, contained explosion to fire them that fast, and this is the stuff that makes the magic happen.
[He uses his sparker to light the powder, quickly jumping back with an almost manic grin on his face. In a flash, the tiny collection of powder goes up in flames that rise up off the stone about 6 inches with no wood or fuel in sight. The flare-up only lasts 3 or 4 seconds and leaves behind nothing but black powder ash and scorched stone. He looks to Billie, clearly expecting her to be as impressed as he was.]