Battle Arms Development's latest, cost friendly Enhanced Bolt Catch, from 8620 Heat Treated Investment Cast Steel, is a must have upgrade that is simple to install and improves the functionality of any Mil-Spec compatible AR-15 / M16 / M4 lower receiver.  

Enhanced Control Surfaces, Better Ergonomics, Lightweight Engineering, 8620 Heat Treated Investment Cast Steel and Versatile Modular Design for Future Add-On Product(s).

Specifications:

• 8620 Heat Treated Investment Cast Steel
• Oversize Control Surfaces for Easy Engagement
• Lightweight but Robust Design 0.39oz (MilSpec Bolt Catch - approx 0.42oz)
• Raised "T-Shaped" Heel Provides Positive and Distinctive Control Surface for Bolt Lock Back
• Compatible with Norgon Ambi-Catch Without Interference
• Elegant Tapered Control Surface and Skeletonized Design
• Bold Horizontal and Diagonal Serrations Provides Positive Purchase
• Versatile, Modular Design for Future Add-On Product(s)>
• Manganese Phosphate Black Finish 

Note: Bolt catch roll pin, detent, spring, not included.