Aluminum Spacers 3/8in ID x 3/8in Long

The Aluminum Spacers 3/8in ID x 3/8in Long from ALLSTAR PERFORMANCE are precision-engineered fastening components designed for firearms, mechanical assemblies, and tactical equipment builds where exact spacing and alignment are mission-critical. These spacers excel in applications requiring repeatable dimensional control—from receiver assembly to accessory mounting—where even minor tolerance stacking can compromise reliability or zero stability. Whether you're a gunsmith, law enforcement armorer, or tactical builder, these aluminum spacers provide the dimensional accuracy necessary to achieve professional-grade assembly standards.

Constructed from aerospace-grade aluminum, the 3/8-inch inner diameter and 3/8-inch length specification ensures compatibility with standard fastener sizing while maintaining a lightweight profile—critical in tactical and competition applications where every fraction of an ounce impacts handling dynamics and fatigue. The aluminum material resists corrosion better than steel spacers in humid or outdoor environments, while remaining machinable for custom modifications if needed. The precise dimensional tolerance inherent to ALLSTAR PERFORMANCE manufacturing means you can stack multiple spacers with confidence, knowing each unit will maintain exact spacing without binding or play.

These spacers benefit gunsmiths performing precision AR-platform builds, bolt-action rifle customization, and optic rail adapter installation where micro-adjustments elevate zero stability and recoil management. They're equally valuable in mechanical assemblies, chassis systems, and modular equipment configurations where repeatable part sourcing prevents rework during assembly. The lightweight construction (0.04 lbs per unit) makes them ideal for weight-sensitive tactical rigs, and their compact dimensions (3.5 x 0.45 x 4.55 in) allow seamless integration into tight mounting spaces without compromising structural integrity.