 If you liked
Gun-Ota ga Mahou Sekai ni Tensei shitara, Gendai Heiki de Guntai Harem wo Tsukucchaimashita!?
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 ...then you might like
Manuke na FPS Player ga Isekai e Ochita Baai
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Both have male protagonists that uses a gun as a weapon in a magic-fantasy world.
One protagonist was transported, while the other was reincarnated into the world.
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Recommended by MagicFlier