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Sig P365 FUSE

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Sig P365 Fuse w/ Romeo-X Enclosed
Sig P365 Fuse w/ Romeo-X Compact

Almost as if inspired by the Maskas Precision/Icarus Precision build, Sig has now released its own full size P365. This new addition to the lineup offers a 4.3" barrel for proper 9mm ammunition performance and 10, 17, or 21-round capacity while maintaining the slim 1.1" width that made the P365 so popular for carry.

Initial Sig P365 Fuse Details
Initial Sig P365 Fuse Details

What is it? The Sig P365 Fuse is a full-sized handgun based on the P365 FCU. By using an X-Macro-sized grip 17 round and now 21-round magazines can be used and the new slide stretched the barrel out to 4.3" for true 9mm performance. Sig has also dropped the propietary rail for 1913 rail which means a wider variety of accessories can be attached.

Sig P365XL laid atop the P365 Fuse. The 365 Fuse is only marginally larger than a 365XL and offers full 9mm ballistics and increased capacity.
Sig P365XL laid atop the P365 Fuse. The 365 Fuse is only marginally larger than a 365XL and offers full 9mm ballistics and increased capacity.

Who's it For? This might be one of the most versatile firearm of late. While the on-paper specs of a longer barrel and higher capacity make it sound like a hip anchor, the slimness of the 365 means this could also be concealed by many. The great potential with the Sig P365 Fuse is to have a single firearm that can be good on the range, carried, or as a home defense option.

The Sig P365 Fuse includes three backstraps.
The Sig P365 Fuse includes three backstraps.

Take a look at the P365 Fuse in the tabletop video below. Note: This was a media sample sent in advance and so contents may be different from final-production.


Specifications:

Price w/o optic:

Price w/ optic:


Sig P365 Fuse Specifications
Sig P365 Fuse Specifications

This new size format is an excellent option for those smartly wanting full-size performance, but who have smaller hands and as a result have been stuck with smaller handguns. The width of the original P365 has been preserved, but now there's ballistics and ammunition capacity.

Sig P365 Fuse next to a P320 Compact build shows the width difference.
Sig P365 Fuse next to a P320 Compact build shows the width difference.
Behind this P320 X-Compact L2D Combat/Icarus precision build the P365 Fuse still looks smaller.
Behind this P320 X-Compact L2D Combat/Icarus Precision build the P365 Fuse still looks smaller.

The new Romeo-X Enclosed ($479.99 direct from Sig) red dot is an enclosed emitter; something I think any dot intended for anything other than range use should be. It also sits low enough to permit co-witness with the Dawson Precision sights; an additional feature I would require before carrying a pistol equipped with a dot.

Sig Romeo-X co-witnesses with the included Dawson Precision sights on the P365 Fuse.
Sig Romeo-X Enclosed co-witnesses with the included Dawson Precision sights on the P365 Fuse.

When first trying the Maskas Precision XXL slide the longer sight radius, slower-moving slide, and extra muzzle energy were all greatly enjoyed. With the P365 Fuse we've now gone even further, plus the use of a longer recoil assembly means the recoil impulse might be even smoother. Of course the only fair way to review a firearm and feel for those changes is to follow the same protocol used on pervious models. For GBGuns that includes:

  • Cold Shots: Truly the first rounds through the gun. No warm up, no practice.

  • Full Magazine +1: Suprisingly some modern guns still struggle with this. It's a test of how much play is in the magazine as well as how the slide cycles with pressure. This is also when I do my best to learn the trigger.

  • What's For Dinner™: A test to see what ammunition the gun will eat. Does the gun feed the round from slide lock, will it cycle and feed another round of the same type, does the slide lock to the rear on empty, and is there any notable point of impact change with different loads.

WFD for the Sig P365 Fuse
WFD for the Sig P365 Fuse

For this gun we used the following ammunition:

Priced and linked where found at the time this article was written

65gr Norma Frangible

70gr Federal Frangible $31.99 / 50 direct from Federal

115gr Winchester Silver Tip $16.56 / 20 at Firearms Depot

115gr Hornady American Gunner $18.35 / 25 at Global Ordnance

115gr Blazer Aluminum-cased FMJ $11.99 / 50 at True Shot

124gr Federal Premium Tactical HST $39.99 / 50 at Target Sports USA

130gr Federal Syntech PCC $28.99 / 50 direct from Federal

147gr PPU Defense Line JHP $23.74 / 50 at Sportsman's Guide

165gr AMMO, Inc /stelTH $24.99 / 50 at Palmetto State Armory

Range Ammo was Browning 115gr FMJ $115 / 500 at Ammunition Depot

  • Sights & Trigger Control: on a 6" spinner target at a distance of 12 yards. We got this from Titan Great Outdoors and use it to gauge how learnable the trigger is and usable the sights are for forced, timed, precise shots.

  • Practical Accuracy: Five shots from a distance of seven yards at a one inch target. This isn't so much about printing a tight group as it is a culmination of our shooting experience and time for us to collect thoughts prior to making a conclusion.

  • After Shots: Final impressions and reflections from the range session.


The entire process for the Sig P365 Fuse w/ Romeo-X Enclosed can be seen in the Shooting Impressions video below.

Ammunition seen in our Shooting Impressions video was made possible by our Patrons and supporters of our ammunition savings account through Ammo Squared.


On the Range both Teya and I were impressed with how nicely the P365 Fuse shot. We expected the longer grip to work well for us as it did once we changed backstraps, but what we did not know was how much of a difference that longer recoil assembly would make. The smoother recoil impulse makes me wonder about other guns that have used the same recoil spring with different length slides and what they might have missed out on.

A subtle, but functional magazine well is included with the P365 Fuse. We found the grip texture effective on a sweaty range day.
A subtle, but functional magazine well is included with the P365 Fuse. We found the grip texture effective on a sweaty range day.

We had spectacular accuracy with multiple loads and overall a great time with what I think can be the "do all" gun for those who have been looking for something slimmer that still offers full 9mm ammunition capabilities and higher capacity. On the topic of capacity we had one 21-round magazine that did not want to take a 21st round, but this may break in over time.

Another note of learning was in getting better with the P365 trigger. The trigger is not known for being great and some might dislike the length of stroke and weight of it, but, when shot with the "modern" (returning to revolver skills from decades ago) style of simply stroking through the pull for each shot rather than prepping and breaking, we had no issues putting up good groups or firing when we needed to in the Sights & Trigger Control segment.

Aside from style, those slide cuts seem to balance the weight of the longer slide nicely on the Sig P365 Fuse.
Aside from style, those slide cuts seem to balance the weight of the longer slide nicely on the Sig P365 Fuse.

As we've shown, a similar build can be done aftermarket if you already have a P365 FCU, but this pistol shot differently. I suspect slide mass and recoil assembly made the difference. While the P365 Fuse is still a thin gun, it was very comfortable to shoot and not one I'd be afraid to attend a course with once I've got enough magazines.

It might be a "full size" but the P365 Fuse is still a P365.
It might be a "full size" but the P365 Fuse is still a P365.

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3 Comments


I watched the video of the SIG NEXT intro and it looks like they're going full steam ahead. This caught my interest, so I looked into it. Street price without RDO is about $699, and nobody has them yet including the major distributors. My local Mil/LEO distributor (Gulf States) told me they are at least three months out but could be sooner. My preference would be two 17-round mags and one 21-round, but spares should be readily available.

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Thanks for the review.. Im not surprised that Sig came out with this …. Seems like the Micro 9’s are growing and growing in size !!!

The P320 has its followers… but it is falling behind… basically a striker version of the P250 …

And Sig needs to compete …

I believe that Taurus already has a GX4 in this configuration in process .. basically a bigger GX4 Carry

AREX had thin fullsized pistols .. not as thin as this model.. but not far off …


Thanks Again

Have a great day !!

Bill

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I get that at this point nothing with the 365 or 320 is going to be a"groundbreaking" change.

But I do love to see the product line continually being supported and improved.

Another step forward

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