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Geissele 02-313 – Trigger Fitting Pin (Installation Tool)

The original Geissele Automatics 02-313 installation tool designed for easier installation of trigger assemblies into AR-15 / AR-10 platforms.

This tool serves as a "slave pin" / alignment pin that helps precisely align the trigger, hammer, and their pins during installation. It significantly simplifies assembly, reduces resistance when inserting pins, and minimizes the risk of damage to the receiver or trigger components.

Features

• Manufacturer part number: 02-313
• Type: trigger installation tool (trigger fitting pin)
• Compatibility: AR-15 / AR-10 (small pin systems)
• Material: steel + polymer/composite elements (depending on version)
• Function: alignment of trigger and hammer pins during installation
• OEM tool by Geissele Automatics
• Made in USA

Advantages

• Significantly simplifies trigger installation
• Helps precisely align parts within the receiver
• Reduces the risk of damage to pins and the receiver
• Speeds up installation and removal of trigger groups
• Suitable for professional and hobbyist AR platform builds