The Spike's Tactical Spartan Forged Stripped AR-15 Lower is a multi-caliber stripped lower receiver built from 7075 T6 aluminum with a black hardcoat anodized finish. It works as a foundation for custom AR-15 builds across a range of calibers. 
 

Key Specifications: 

• Brand: Spikes Tactical 
• Model: Spartan Forged Stripped AR-15 Lower 
• Caliber: Multi-Caliber 
• Type: Forged Lower Receiver 
• Finish: Black Hardcoat Anodized 
• Material: 7075 T6 Aluminum 
• Pin Hole Diameter: .154" (for trigger and hammer pins) 
• Condition: New in Box 
   

Detailed Features: 

The Spartan lower has a black hardcoat anodized finish that resists wear and corrosion. The 7075 T6 aluminum keeps it light without sacrificing structural integrity. 
 
Standard .154" pin holes mean it accepts most aftermarket triggers and components without modification, which matters when you're building around a specific trigger group.

Owners of the Spike's Tactical Spartan lower generally speak positively about the build quality and the Spartan engraving, and the multi-caliber design is a frequent selling point for people running several upper configurations. Fit with mil-spec and aftermarket parts is usually described as good.

Pricing draws some debate -- many think the quality justifies it, others look at cheaper alternatives. During high-demand periods, availability and shipping delays have come up in discussions. Overall the reception is solid among builders who prioritize quality and customization flexibility.