KMT 4# Firing Pin Spring For Glock Gen 1–4 – Midweight, Stainless Steel, All Models

This here’s a KMT 4-pound firing pin spring made to fit all Glock models from Gen 1 through Gen 4.

It’s brand new and still in its original packaging.

The spring is stainless steel, midweight, and designed to give you reliable ignition without being too heavy.

Part number is SP00063 or FSP-4#.

Whether you’re tuning your trigger or just swapping out old parts, this is a solid upgrade or replacement.

Works across the board—no need to worry about model compatibility.

Simple drop-in part that makes a difference.

Good to go right out of the bag.