Tihon AR-15 Safety Detent Kit – brass selector detent + spring

Drop-in AR-15 selector kit combining a precision-machined brass safety detent and a heat-treated detent spring for crisp Safe/Semi indexing, reliable FCG operation and consistent feel under hard use. Keywords: AR-15 safety detent kit, brass selector detent, safety detent spring, MIL-SPEC.

What’s included

• AR-15 safety selector detent (brass, precision machined) – 1 pc
• Safety detent spring (spring steel, heat-treated) – 1 pc

Key benefits

• Crisp selector clicks – positive, repeatable indexing without mush.
• MIL-SPEC fit – compatible with most AR-15 lowers and AR-10 lowers built to the AR-15 selector interface.
• Brass detent – non-ferrous, corrosion resistant and low friction for smooth operation.
• Heat-treated spring – stable preload and extended service life.
• Easy installation – true drop-in, no special tools.

Purpose

The kit keeps the safety lever locked in the selected position, prevents unintended movement and stabilizes the fire control group during sustained fire.

Compatibility

• Platforms: AR-15; AR-10 lowers that follow AR-15 selector geometry.
• Selectors: standard and ambidextrous.
• Grips: A2/aftermarket grips with a detent-spring channel.

Materials & finish

• Detent: brass, precision turned; will naturally develop a patina over time.
• Spring: spring steel, heat treated; anti-corrosion protected.
• Tolerances: MIL-SPEC geometry for consistent seating.

Installation

1. Insert the brass detent into the selector bore in the lower receiver.
2. Place the spring in the pistol-grip channel and secure the grip.
3. Do not overtighten the grip screw to avoid binding the selector movement.

Specifications

• Type: Safety Detent Kit (detent + spring).
• Function: positive Safe/Semi locking with stable detent preload.
• Install: drop-in, no modification.

FAQ

Selector feels mushy or overshoots clicks – fixes

Common causes are a worn detent or an over-compressed/short spring. Replace the detent and verify spring length and preload.

Do I need lubrication

A light coat of gun oil during routine cleaning is sufficient.