AR-15 Match Grade A2 Rear Sight Base Ball, Rear Base Ball Bearing ONLY

AR-15 A2 Rear Sight Base Ball Bearing - Precision Steel Replacement

This is a precision steel ball bearing designed as a replacement component for AR-15 A2-style rear sight assemblies. The bearing provides the positive detent and reliable indexing that keeps your sight adjustments locked in place during shooting. When the original bearing wears or becomes damaged, this replacement restores the crisp, positive feel of your elevation and windage adjustments.

Key Features

• Precision spherical steel ball bearing for positive detent action
• Natural polished steel finish resists corrosion
• Direct replacement for A2-style rear sight assemblies
• Ensures reliable indexing during sight adjustment
• Restores crisp adjustment feel to worn sight mechanisms

Perfect For

• AR-15 shooters with A2-style rear sights needing replacement components
• Builders maintaining or repairing existing sight assemblies
• Users experiencing loose or inconsistent sight adjustments
• Anyone restoring function to worn detent mechanisms

Precision Detent Function

The ball bearing is the critical component that creates positive detent in your A2 rear sight. When you adjust elevation or windage, the bearing seats into indexed positions and holds your adjustment locked. Over time or with heavy use, this bearing can wear smooth or become damaged, causing your adjustments to feel loose or fail to hold position. This replacement bearing restores that positive lock and ensures your sight stays where you set it.

Steel Construction and Durability

Made from precision steel and finished in natural polished steel, this bearing resists corrosion and maintains dimensional accuracy over extended use. The spherical design ensures even contact and consistent detent pressure across all adjustment positions. The polished finish prevents binding and allows smooth indexing action.

Follow safe handling and manufacturer instructions. Ensure compatibility with your specific A2-style rear sight assembly before installation. Verify the bearing seats properly and functions smoothly after replacement.