Guillotine Cold Weather Recoil Spring for GBBR M4

If you've ever taken your GBBR M4 out in cold weather and watched the cycling slow down or stop altogether, you already know the problem. Gas pressure drops in the cold, and a standard recoil spring that works fine in summer can become too stiff for the system to handle when temperatures fall.

The Guillotine Cold Weather Spring is designed specifically for this. It's a lighter spring that lets the bolt carrier cycle properly even when gas pressure is reduced, keeping your rifle running reliably through autumn and winter games.

Made from PVD-coated stainless steel for durability and corrosion resistance. It's a small upgrade that makes a real difference when the temperature drops.

In the box: 1× Guillotine cold weather recoil spring