YHM is proud to offer our YHM-15 lower receivers. These lowers are machined 100% in house from forged 7075-T6 aluminum. They feature over sized magazine well chamfers for easier magazine changes. - These lowers were designed and are MACHINED 100% IN HOUSE - Made from 7075-T6 aircraft grade aluminum (Forged) - Features over sized magazine well chamfers for easier magazine changes - Accepts All Generations of PMAG's - Accepts Mil-Spec Upper receivers - Fits all standard parts - Hardcoat Anodized matte black to Military Specifications or better