Our advice tends to be to direct people to use their best judgement.
The system as defined in the manual is that the issuing authority for the fleet has a broad discretion for how to record and allows for, e.g., awarding extra credits to game masters. As a practical standpoint our office can't realistically have full taxonomy authority both because the awards come from the fleet level (often being reported from the ship level as "Spacer Smith has earned X credits in Plasma Carbine") and because it requires detailed knowledge of the game in question, we can only advise how we might classify a game based on what we know.
There is also the reality that some games can be multiple genres, and as long as the recording is consistent, neither one is really wrong.
From my reading about the game I am under the impression that is a game designed to be played in under 30 minutes and has a relatively simple set up with no combat, but board game geek didn't have a lot of details about the game and I could be mistaken about that.
If you think it fits the description for Flechette better than Grenade, I'm inclined to accept that.
Marksmanship Manual Pg5 wrote: Grenade (Party/Casual Games)
A game that qualifies for the Grenade category is designed to be played as a casual entertainment at a party-style gathering. These games will typically include six or more players and be simple card or dice games, sometimes with simple boards or other play aids. Casual games require very little setup, and are often humorous or lighthearted in theme.
BGG keywords often associated with Grenade category: card game, party game, trivia, word game, humor, music, real-time.
EXAMPLES: Cards Against Humanity, Munchkin (multiple versions), Scene-It! (multiple versions), Twister, and Zombie Dice.
Marksmanship Manual Pg6 wrote: Flechette Gun (Tactical Board Games, CCGs, Deck Building Games)
These games are board games in which the players control a single person or a small group of people. Combat may occur, but it is not the focus of the game. These games also do not typically have the sort of individual unit detail as a wargame, with more abstraction in the game design. For example, both X-Wing and Battlestar Galactica handle space fighter combat. In X-Wing, each fighter’s precise movement and distance are the focus of the game. In Galactica, the fighter’s locations are generalized and their maneuvers are abstracted. The latter style of game design is appropriate to Flechette Gun, not Pistol.
BGG keywords often associated with Flechette Gun category: Various, but wargame is a clue the game goes in Pistol or Rifle.
EXAMPLES: Firefly, Battlestar Galactica, Dwarven Dig, Dungeons & Dragons Adventure System games (multiple), Poker, Blackjack, and traditional card games.
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