Radical Firearms Radical Complete Lower Multi Caliber Ar15 Rf01623

The Radical Complete Lower from Radical Firearms is a robust AR-15 lower receiver in the AR-15 Lower series that gives builders a reliable foundation for custom rifles and multi-caliber builds, and because this is a functional lower it requires an FFL transfer and carries the manufacturer firearm code; you'll appreciate how the multi-caliber capability accommodates caliber conversions and drop-in upper compatibility for hunting, range work, duty use, and precision practice, while fitting seamlessly with Radical Firearms lower parts kits and AR15 parts during assembly or when refreshing worn components. The machined contours and durable construction make it a solid match for complete build kits and upgrade projects, providing consistent alignment with barrels and fire control groups to maintain accuracy and reliability under extended use. If you're assembling a tailored AR platform, the Radical Firearms complete lower streamlines parts selection and installation, supports common AR-15 furniture and accessories, and is a smart choice for anyone looking for a versatile lower receiver that balances strength, fit, and multi-caliber flexibility.