Charlie's Custom Clones stocks Geissele lower receivers purpose-built for clone-correct MK18 CQBR, URGI, and SOPMOD configurations. Every Geissele stripped lower in this category is spec'd to the same mil-spec standards used in SOCOM-issued builds — forged 7075-T6 aluminum, properly staked castle nut, and the dimensional tolerances that make Geissele the first choice for serious clone builders.
Geissele's lower receivers are a direct-fit companion to their URGI uppers and Super Duty rifles. If you're building a clone-correct MK18 Mod 1 or a USASOC URGI configuration, starting with the correct lower isn't optional — it's the foundation. CCC carries both stripped lowers and complete lower assemblies so you can spec the build your way.
All Geissele lower receivers shown below are in stock and ready to ship. Filter by type — stripped lower, complete lower, or lower parts kit — using the sidebar. Questions about compatibility with a specific URGI or MK18 upper? Contact us — we build these every day.
Pair your Geissele lower with a complete upper from our MK18 & URGI uppers category, or browse clone-correct complete rifles if you want a ready-to-shoot configuration.