Anti-walk pins are great for drop-in triggers; they replace the original hammer and trigger pins and are retained by special retaining for a positive lock. One side is flared and broached, and the other side is threaded for a screw.
AR-15 Complete Anti-Rotation Trigger/Hammer Pin Set (Anodized Black) » Guntec USA
JE Machine AR Anti-Walk/Anti-Rotation Trigger & Hammer Pins
Davidson Defense Triggers Gun Parts
$4.99 Anti-Walk Pins 📢 $29.99 Ultra Slim Handguard 📢 $5.99 Folding Knife - Delta Team Tactical
Hammer & Trigger Anti-Rotation Walk Pins - ACME Machine
Strike Industries Anti-walk/Anti-rotation Trigger/Hammer Pins
JE Machine
Stainless Anti Walk Pins, AR 15 Parts
JE Machine
$4.99 Anti-Walk Pins 📢 $29.99 Ultra Slim Handguard 📢 $5.99 Folding Knife - Delta Team Tactical