AR-15 Bolt Catch Plunger Mil-spec

Every AR-15 build or repair needs reliable, mil-spec components to function correctly, and the bolt catch plunger is a critical one. This small but essential AR-15 part is responsible for ensuring your bolt catch operates smoothly and locks the bolt back reliably after the last round. Whether you’re assembling a new lower receiver or replacing a worn or lost component, this mil-spec bolt catch plunger from Miami Shooters Supply is the exact part you need for guaranteed compatibility and performance. We ship fast so you can get back to building or maintenance without delay.

Key Features

• Manufactured to U.S. Military Technical Data Package (TDP) specifications for guaranteed fit and function.
• Heat-treated steel construction provides superior strength and long-term durability under repeated use.
• Precision-machined dimensions ensure seamless operation with standard mil-spec bolt catches and springs.
• Correctly sized plunger head engages the bolt catch pin securely for positive lock-up every time.
• Essential for completing any AR-15 lower receiver assembly or for repairing a malfunctioning bolt catch mechanism.

Built For

This part is essential for armorers and builders completing a stripped lower receiver, as it’s a required component for the bolt catch assembly. It’s also the perfect solution for any shooter needing to replace a lost, damaged, or out-of-spec plunger that is causing bolt catch issues. If your bolt catch feels sloppy or fails to lock the bolt back, this is often the culprit.

Specifications

• Material: Heat-Treated Steel
• Finish: Phosphate (Parkerized) for corrosion resistance
• Compatibility: Fits all mil-spec AR-15/M16 pattern lower receivers
• Caliber Compatibility: Multi-caliber (part of the lower receiver assembly)
• Package: Includes necessary spring (unless otherwise noted at time of purchase)

FAQ

Is this a complete bolt catch assembly?
No, this is specifically the plunger (and typically the spring) for the assembly. You will also need the bolt catch lever and the roll pin to complete the installation.

Will this work with my commercial or proprietary lower receiver?
It is designed for mil-spec AR-15 lowers. While it may fit many commercial designs, we recommend verifying your lower’s specifications. For true mil-spec lowers, it is a direct drop-in part.