The Sharps Bros Livewire is a stripped AR-15 lower receiver machined from 7075-T6 aluminum with a black anodized finish. It ships with a threaded bolt catch pin and is compatible with the full range of mil-spec AR-15 upper receivers and components. 
 

Key Specifications 

• Caliber: Multi-Caliber 
• Model: Livewire 
• Series: Stripped Lower 
• Type: Stripped 
• Firearm Fit: AR-15 
• Includes: Threaded Bolt Catch Pin 
• Receiver Finish: Black Anodized 
• Receiver Material: 7075-T6 Aluminum 
• Weight: 8.70 oz 
   

Features 

 
7075-T6 aluminum gives it a good strength-to-weight ratio and holds up well to regular use. The black anodizing is applied evenly and resists wear and corrosion. The threaded bolt catch pin simplifies installation compared to a standard roll pin and reduces the chance of marring the lower during assembly. The stripped configuration means you bring your own fire control group, pistol grip, stock, and buffer system — which is the point for anyone doing a full custom build. Multi-caliber compatibility means any standard AR-15 upper will fit.

Builders who buy the Livewire lower tend to focus on the machining quality and the distinctive Sharps Bros aesthetic. The anodizing is consistently described as clean and even. Fitment with mil-spec uppers and aftermarket components gets good marks, though a small number of users have run into tight tolerances with specific aftermarket parts — worth checking if you have unusual components planned.

The threaded bolt catch pin is mentioned as a genuine improvement over roll pins for builders doing the work themselves. Weight is 8.70 oz, which some find slightly heavy relative to budget stripped lowers, while others don't consider it an issue.

The price is higher than generic stripped lowers, and opinions split predictably: builders who care about the Sharps Bros design and machining quality consider it worth it; those focused purely on function at the lowest cost usually look elsewhere. No significant reliability or defect complaints in the discussions.