The modern defensive rifle build demands components that balance durability, compatibility, and straightforward functionality. For builders and armory professionals who prioritize strength and a clean platform for multi-caliber setups, a proven forged lower is a cornerstone investment.

SPIKE’S TACTICAL STRIPPED SPIDER LOWER RECEIVER sits at the intersection of service-grade metallurgy and practical feature design. This stripped lower is constructed from 7075 T6 forged aluminum and finished with a MIL-A-8625F Type III Class 2 Hard Coat Anodized surface in a black finish — a combination that delivers corrosion resistance and rock-solid wear characteristics while keeping weight low. Shop this product

Key features and tactical benefits

The Spider model is designed as a multi-caliber, low-shelf lower that is RDIAS compatible — making it suitable for a variety of mission profiles and caliber conversions when paired with the correct upper and components. The ST Spider Logo is prominently stamped on the left side of the magwell, and selector markings use bullet pictograms for a clean, intuitive visual reference. This lower ships stripped, so you’ll need a lower parts kit, buffer, and stock of your choosing to complete the build. The MSRP-friendly price of $79.19 makes it a cost-effective foundation for duty or range rifles.

Why 7075 T6 and Type III hard coat matter

7075 T6 aluminum provides yield strength and fatigue resistance well-suited to high-cycle operation. The MIL-A-8625F Type III Class 2 anodizing further protects the surface from abrasion and solvents commonly encountered in service and training environments. For armory managers and serious builders, those two specs signal longevity under real-world use.

Compatibility and practical considerations

Because it’s low-shelf and RDIAS compatible, this lower is an adaptable platform for users who plan to install retrofits, bolt-on RDIAS systems, or experiment with multi-caliber uppers. The Spider is the standard lower on all ST-15 LE rifles, so parts compatibility with Spike’s Tactical components is a practical advantage for LE-style builds.

View product details and pricing to confirm fitment with your intended lower parts kit and buffer system before purchasing.

For builders seeking a durable, service-minded lower that won’t break the budget, the Spider lower offers proven materials, practical markings, and compatibility with RDIAS installations. Check current availability and secure one for your next build at the shop page linked below — purchases from the product page will direct you to the retailer’s checkout for completion.

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