Fuse 4.3" P365 Tungsten Adjustable Recoil Spring Assembly

Adjustable recoil spring assembly for the P365 Fuse 4.3", with a flatwire spring and solid tungsten guide rod.

Product Specifications

• Spring type: Flatwire
• Guide rod: Solid tungsten, 46 grams
• Spring weights: 10, 12, 14 (stock) and 16 lb

What's included

• Tungsten guide rod
• Stepped spacer
• 4 springs: Green 10 lb, Yellow 12 lb, Orange 14 lb (stock), Red 16 lb

Fits

• P365 Fuse 4.3" barrel models

Installation

1. Install the stepped spacer in the slide, small end in the slide opening, so it sits flush with the end of the slide.
2. Start with a lighter spring and work up as needed.
3. Put the spring on the guide rod.
4. Hold the slide in your left hand, muzzle pointed away, and hold the spring in place.
5. Push the guide rod in with your right thumb until it seats on the barrel lug.

Tuning

1. Find which spring rates cycle reliably with your ammo, shooting style and setup.
2. Shoot each of those rates in 5 to 6 shot groups at a small target.
3. Pick the spring that gives the best follow-up groups. Most shooters end up lighter than stock unless they run suppressors, thread-on comps or other add-ons.

Fitment guide: See our Sig P365 Fitment Guide for full slide, barrel, and recoil spring compatibility.

Shipping and returns

See our shipping and returns policy for processing times and return details.