This guide details the installation of an optic onto the Springfield Armory Echelon 4.0C using its proprietary Variable Interface System (VIS). The process emphasizes using the correct VIS pin for optic compatibility and ensuring secure mounting. Instruction is informed by the expertise of Travis Haley and Rob Leatham, highlighting the pistol's design for high-stress scenarios.
This entry details the rare Walther KPK prototype pistol, presented by Ian McCollum of Forgotten Weapons. It highlights the KPK's design as a compact service sidearm, featuring an aluminum alloy frame for weight reduction and a distinctive hammer shroud for snag prevention. Mechanically similar to the PPK, it was chambered in .32 ACP and likely produced in limited numbers (<10) during early WWII.
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