Spike's Stripped Upper/lower Set Spi

The Spike's Stripped Upper/Lower Set (STS1019) is a precision-engineered AR platform component set built from 7075 T6 aluminum, one of the strongest alloys available for firearms manufacturing. This matched upper and lower receiver pair forms the regulated foundation of a multi-caliber AR build, eliminating the need to source compatible components separately. Spike's Tactical designs these sets to exacting standards, ensuring tight tolerances and reliable function across diverse ammunition types and operational demands.

The Type III Class 2 hard-coat anodized finish provides superior corrosion resistance and wear protection compared to standard anodizing, making this set suitable for extended field use, adverse weather conditions, and high-round-count training cycles. The 7075 T6 aluminum maintains dimensional stability under sustained firing schedules while keeping overall weight manageable—critical for operators running extended patrol or competition formats. The multi-caliber design allows flexibility in upper selection, enabling configuration for common intermediate cartridges without receiver replacement.

This receiver set serves competitive shooters, law enforcement armorer programs, military personnel building personal rifles, and tactical enthusiasts seeking quality matched components. The stripped configuration—devoid of internal parts, springs, and trigger mechanisms—appeals to builders who standardize on specific fire control groups or who require compliance with local regulations. Spike's reputation for precision manufacturing ensures these receivers lock up tight with quality uppers and maintain zero consistency through thousands of rounds.

The modular AR platform's versatility depends on reliable core components, and a matched upper/lower pair eliminates tolerance stack-up issues common when mixing receivers from different manufacturers. This set provides the foundation for mission-configurable rifles—swap uppers to shift roles from precision intermediate distances to close-quarters work—while the receivers themselves remain the precision baseline.