Is Kurogane no Linebarrels Specials hentai?
English title: Linebarrels of Iron
No
Rated R (17+ (violence & profanity)) on MyAnimeList and not tagged as Hentai.

Special · 2009 · 2 episodes · R - 17+ (violence & profanity)
Comedy, Ecchi, Mecha, Seinen
Episodes 25 & 26, added to DVD.
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