FN F2000/P90 Hybrid Rifle (Appleseed Alpha)
Seburo C-26A (Ghost in the Shell: Stand Alone Complex)
Hellsing Arms .454 Casull & Jackal (Hellsing Ultimate)
Dominator (Psycho-Pass)
Schrödinger (Ghost in the Shell: Arise)
@Selaphiel
The gun with a Roller-Delayed Blowback, that will eventually used by H&K in the coming years.
@NitroFury
Speaking of last-ditch Axis weapons, the Shitosubakurai:It was a hand-held antitank mine on a stick. It killed its user pretty reliably but was only so-so against American tanks.
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