AR-15 Selector Detent Pin

Every AR-15 lower receiver build requires a selector detent pin, a small but absolutely critical component. This tiny pin, combined with its spring, is what provides the positive click and secure positioning of your safety selector switch. Without a properly functioning detent, your selector can become loose, unreliable, or even unsafe. Miami Shooters Supply provides this essential AR-15 part with the quality and fast shipping that builders and armorers count on to complete their projects without delay.

Key Features

• Manufactured from hardened steel for maximum durability and resistance to wear.
• Precision-machined to exact mil-spec dimensions for reliable fit and function.
• Designed to work with standard selector springs and lower receiver channels.
• Essential for assembling a new lower or replacing a lost or damaged original part.
• Simple, no-frills design that performs a vital function in your rifle’s fire control system.

Built For

This detent pin is built for the AR-15 builder completing a stripped lower receiver, whether it’s their first or fiftieth. It’s also the exact replacement part for armorers and gun owners performing routine maintenance or repairing a lower where the original detent has been lost, damaged, or worn.

Specifications

• Material: Hardened Steel
• Finish: Phosphate or Nitride (varies by lot, all are corrosion-resistant)
• Compatibility: Fits all mil-spec AR-15/M16 pattern lower receivers.
• Caliber Compatibility: Universal for all calibers built on an AR-15 platform lower.
• Package: Single detent pin; spring sold separately unless noted in kit.

FAQ

Is this just for new builds, or can it be used as a replacement?
Yes, this AR-15 selector detent pin is perfect for both applications. It is a direct replacement for any mil-spec detent in an existing lower and is a required component for any new lower receiver assembly.

Do I need any special tools to install this detent pin?
Installation requires a standard detent installation tool or a set of roll pin punches to correctly depress the spring and seat the pin into the lower receiver’s detent channel. Using the proper tool prevents launching the tiny pin across your workshop.