The Geissele Super Duty lower receiver is the standard for USASOC-inspired and clone-correct M4A1 builds. Forged mil-spec, offered in the full Geissele color lineup — Black, Desert Dirt Color (DDC), OD Green, Iridium, and Luna Black — the Super Duty lower is the correct foundation for URGI, FBI HRT, and USASOC impression builds.
Charlie's Custom Clones carries the complete Geissele Super Duty lower receiver lineup, including virgin stripped lowers, complete lower assemblies with mil-spec lower parts kit, and matched upper/lower receiver sets. We stock factory blem units when available — the same receiver with minor cosmetic imperfections at a reduced price, inspected and fully functional.
Whether you're building a clone-correct URGI, a period-accurate 2020-era USASOC carbine, or simply want the best American-made mil-spec lower, the Geissele Super Duty is the right foundation. Browse current stock below.