CMMG Mk9 9mm AR-15 Complete Lower Receiver - 90CA360
This is the perfect complete lower for your custom 9mm AR-15 build. CMMG 9mm lowers feature a dedicated magwell, unlike most other companies. This eliminates the need for the 9mm magwell conversion, and looks better too! Features a mil-spec buffer tube assembly and collapsible stock. The lower is has a military type hard anodized finish and is machined from a 7076-T6 forging.