$1,149.99
9 in stock
Online inventory may differ from in-store availability.
Quick turnaround so you get your gear sooner.
Trusted checkout with industry-standard protection.
Keeping Traditions Alive Since 1953
Secure Transactions provided with 
The P365 Fuse is Sig Sauer's answer to the question a lot of carry-minded people have been asking: can you get full-size performance without moving to a full-size gun? The answer here is a pretty convincing yes. Built on the proven P365 platform, the Fuse stretches things out with a 4.3" DLC-finished carbon steel barrel and an optics-ready stainless steel slide that runs nearly 7" long. That extended slide gives you a sight radius that competes with much larger pistols, while the grip stays at just 1.1 inches wide. The 21+1 capacity with the included extended magazines is genuinely impressive for how slim this thing carries.
This specific SKU (365XF-9-BFO-RXSL) ships with the Romeo-X SIG-LOC Compact mounted straight from the factory. The Romeo-X uses SIG's SIG-LOC mounting system, which creates five points of contact between the optic and slide to prevent zero shift under recoil and hard use. The optic itself is a fully enclosed, sealed, and purged design built from 7075 aircraft-grade aluminum with an aspherical lens for a clean, distortion-free dot. Side-access battery compartment means you can swap a CR1632 without pulling the optic or losing your zero. MOTAC motion activation wakes the dot the moment you pick the gun up and shuts it off when you set it down, giving it a rated battery life of up to 20,000 hours.
The LXG grip module features laser-engraved texturing for grip without being abrasive, a removable magwell, and three interchangeable backstraps so you can fit the gun to your hand rather than the other way around. The flat-faced nickel-plated trigger and M1913 accessory rail round things out nicely. The iron sights include a fiber-optic front and a black serrated rear that co-witness with the Romeo-X at standard height.
The Fuse ships with three steel magazines: two 21-round extended and one flush-fitting 17-rounder. The 17-round mag keeps the height down for carry, while the 21-rounders give you options at the range or if you want a fuller grip. Holster compatibility is worth noting: most P365 X-Macro holsters with an open bottom will work well here. It's covered by Sig's fully transferable Infinite Guarantee, which means no receipts, no warranty cards.
The Fuse runs a longer 4.3" barrel compared to the X-Macro's 3.7", which adds both sight radius and ballistic performance with modern defensive ammo. The slide is also longer than any other compact in the P365 family, and the Fuse features more aggressive serrations front and rear. The grip module and overall width stay essentially the same, so it still carries slim while shooting more like a full-size gun.
The optic comes factory-installed, but like any red dot, you'll want to confirm and adjust zero before relying on it. Sig recommends starting your zero at 5 to 7 yards on paper and working outward from there. The SIG-LOC mounting system is designed to maintain zero through repeated recoil, and because the battery loads from the side, you won't have to re-zero just to change a battery.
The Fuse with the Romeo-X is the same overall length as the P365 X-Macro, so most P365 X-Macro holsters with an open-bottom design should accommodate it. The Galco Corvus for the X-Macro, for example, has been confirmed to fit. If you're adding a weapon light to the accessory rail, you'll need a holster specifically designed for that light/pistol combination.
No, the P365 Fuse does not come with a manual safety, and Sig does not offer it as an option on this model. It relies on the passive internal safeties built into the striker-fired system, which is the same setup used across most of the P365 line. If a manual safety is a hard requirement for you, you'd want to look at other P365 variants like the P365X or P365XL with the MS designation.
Yes. The Fuse is reverse-compatible with P365 17-round magazines, and it ships with one flush-fit 17-rounder along with two 21-round extended magazines. The 17-round mag brings the overall height down to 5.1 inches, which is more manageable for concealed carry. Older P365 10-round and 12-round magazines will also work in the Fuse.
They share the same general enclosed design and glass quality, but the SIG-LOC version uses a different mounting system. Standard Romeo-X Compact mounts like a traditional optic from the top, while the SIG-LOC version mounts from underneath the slide using five contact points for a lower deck height and a more secure lockup. The SIG-LOC variant is purpose-built for P365 family slides that use the SIG-LOC footprint.
| UPC | 798681713349 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 365XF-9-BFO-RXSL |
| Action | |
| Barrel Length | 4.3'' |
| Caliber/Gauge | 9mm |
| Capacity | 17-Round 21-Round |
| Color | Black |
| Length | 5.7'' |
| Magazine Included | 1 x 17-Round |
| Model | |
| Product Type | Striker Fired |
| Safety | No Manual |
| Shipping Weight | 3.5 |
| Sights | Fiber Optic |
| Slide Description | Serrated w/Optic |
You must be logged in to post a review.
Reviews
There are no reviews yet.