Double-Barrel-Grapple-Gun by TrevorMc112 on DeviantArt

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80 Mjolnir Double Barrel Rifle by DonaldMoore909 on DeviantArt

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Grapple Gun by Sharethisnow on DeviantArt

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Double-Barrel-Grapple-Gun by TrevorMc112 on DeviantArt

Double Barrel Shotgun by EmmaleeSeguin3D on DeviantArt

Double Barrel Shotgun by EJFireLightningArts on DeviantArt

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Sonic Steam Armaments: Part 4 of ?: Duplex Shotgun by IWasATennageDilbert on DeviantArt

WalfaZ Weapon: IZH-43 Double-Barrel Shotgun by MyonNyanMukyuu on DeviantArt

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Concept Shotgun (no name yet) by LucasHC90 on DeviantArt