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Established in 2011, RJK Ventures LLC is a family-owned and operated business that designs and manufactures both our Armory Racks and MAG|Coupler products in the USA for firearms collectors and enthusiasts.

Complete Guide to Magazine Couplers: For a detailed technical overview, installation guidance, and compliance information, read our complete guide here .

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All Armory Racks and MAG|Couplers are designed and manufactured in the USA!

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RJK Collection

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  • A Legacy in Steel: The Story of a 1935 Mauser P.08 Luger

    A Legacy in Steel: The Story of a 1935 Mauser P...

    A detailed look at a 1935 Mauser S/42 “G-Date” P.08 Luger, serial 8134c, examined as both an individual artifact and within the broader context of early Mauser production and Russian...

    A Legacy in Steel: The Story of a 1935 Mauser P...

    A detailed look at a 1935 Mauser S/42 “G-Date” P.08 Luger, serial 8134c, examined as both an individual artifact and within the broader context of early Mauser production and Russian...

  • FFL 03 (Curio & Relic License)

    FFL 03 (Curio & Relic License)

    A practical, collector-focused overview of the Federal Firearms License Type 03 (Curio & Relic). Learn what an FFL 03 is, why collectors research it, and how state-level rules can differ—using...

    FFL 03 (Curio & Relic License)

    A practical, collector-focused overview of the Federal Firearms License Type 03 (Curio & Relic). Learn what an FFL 03 is, why collectors research it, and how state-level rules can differ—using...

  • Walther U.P. Mod. 1

    Walther U.P. Mod. 1

    A detailed look at the Walther U.P. Mod. 1, a mid‑century German Universal‑Pistole designed for 6mm blank, gas, and signal use. Explore its unique front‑loading magazine, safety features, construction, dating,...

    Walther U.P. Mod. 1

    A detailed look at the Walther U.P. Mod. 1, a mid‑century German Universal‑Pistole designed for 6mm blank, gas, and signal use. Explore its unique front‑loading magazine, safety features, construction, dating,...

  • Colt 1903 Pocket Hammerless in .32 ACP and Its Prohibition Era Legacy

    Colt 1903 Pocket Hammerless in .32 ACP and Its ...

    The Colt 1903 Pocket Hammerless in .32 ACP is one of the defining American pocket pistols of the early 20th century. Slim, reliable, and widely carried for decades, it’s a...

    Colt 1903 Pocket Hammerless in .32 ACP and Its ...

    The Colt 1903 Pocket Hammerless in .32 ACP is one of the defining American pocket pistols of the early 20th century. Slim, reliable, and widely carried for decades, it’s a...

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RJK Ventures LLC – Product Reviewer Registration