Aero Precision's M5 .308 Complete Lower Receiver is the perfect base for your custom big-bore AR rifle. 

Features:

• Works with standard AR 308 components and magazines
• Rear takedown pin detent hole is threaded for a 4-40 set screw
• Bolt catch is threaded for a screw pin (no roll pin needed)
• Integrated trigger guard
• Selector markings will work with 45, 60 or 90 degree safety selectors
• Accepts Battle Arms Development short throw safety selectors, but will work with any standard selector
• No gap with aftermarket pistol grips

Includes:

• Aero Precision M5 Lower Receiver
• A2 Grip
• Lower parts kit
• Receiver extension
• .308 carbine buffer and spring
• These parts are installed
• This complete lower does not include a stock. Save on your initial purchase and choose any stock you prefer.