Strike Industries SPBUS Polymer Backup Sights Black for AR-15

Description

The Strike Industries SPBUS (Strike Polymer Backup Sights) is a low-profile folding sight set designed for the AR platform. Constructed from a custom SI Polymer Extreme blend with a steel mounting tab and insert, the SPBUS provides lightweight durability and reduced snag when not in use. Both front and rear sights fold down manually and do not contain an internal spring, preventing unintended deployment. The rear sight offers dual apertures for varying eye relief and target acquisition, while adjustments are made quickly without special tools.

Key Specifications

• The frame material is Steel/Polymer.
• The style is Folding Back Up.
• Designed for the AR Platform.
• Fitment is specified as AR-15.
• Compatibility is 1913 Picatinny rails.
• The rear sight dual apertures measure 4.70mm (0.19″) and 1.75mm (0.07″).
• The sights are 2.3mm (0.09″) taller than standard A2 sights and are optimized to be paired together.
• Construction uses SI Polymer Extreme material with a steel mounting tab and insert for added strength.
• Deployment is manual (no internal spring) to avoid accidental opening.
• Package includes 1 front sight, 1 rear sight, 2.0mm hex tool, and Loctite Blue 243.

Thoughtfully engineered for shooters who want a reliable, low-profile backup to optics, the SPBUS provides fast target acquisition and practical tool-less adjustments for range use, training, and general-purpose AR-15 applications. Its combination of polymer resilience and steel reinforcement delivers a durable, lightweight option that stows cleanly when not in use.