Description
When SIG dropped the P365 back in 2018, it forced every other gunmaker to go back to the drawing board. Ten plus one rounds of 9mm in a gun barely over an inch wide was unheard of at the time, and the formula still holds up. This version, the 365-9-BXR3P-MS, adds two things a lot of carriers have been asking for: a slide cut for a red dot from the factory and a manual thumb safety for that extra layer of control.
An Optic Ready P365 Built for Carry
The Nitron-finished stainless slide is machined for the Shield RMSc footprint, so a ROMEOZero or ROMEOZero Elite drops straight on with no adapter plates to fuss with. Prefer irons? The included XRAY3 day/night sights are some of the best factory sights in the business, with a bright green front dot that jumps out in daylight and tritium vials that glow when the light goes away. Front and rear slide serrations give you solid purchase for press checks and racking, even with sweaty hands.
Micro-Compact Size, Real Shootability
At 3.1 inches of barrel, 5.8 inches overall, and around 17.8 ounces empty, this thing disappears in an inside-the-waistband holster or even a pocket rig. The striker-fired trigger breaks clean and crisp, and the grip module gives most hands enough real estate for a full firing grip, which is a big part of why the P365 shoots so much better than its size suggests. It is also rated for +P ammunition, so you can run hotter defensive loads with confidence.
What the P365 MS Brings to the Table
The frame-mounted manual safety is low profile and easy to sweep off on the draw, and it rides out of the way if you train with it properly. Two 10-round steel magazines come in the box, and the gun accepts SIG's extended 12, 15, and 17-round P365 mags if you want more capacity for the nightstand or range days. Backed by SIG's transferable Infinite Guarantee, this is a carry gun you can buy once and rely on for a long time.
Key Specifications
- UPC: 798681681235
- Manufacturer Part Number: 365-9-BXR3P-MS
- Model: P365
- Caliber: 9mm Luger (+P rated)
- Action: Striker Fired, Semi-Auto
- Capacity: 10+1
- Barrel Length: 3.1 in
- Overall Length: 5.8 in
- Weight: 17.8 oz
- Sights: XRAY3 Day/Night Sights
- Optic Footprint: Shield RMSc (direct fit ROMEOZero)
- Slide: Nitron Stainless Steel, Optic Ready, Front/Rear Serrations
- Frame: Black Polymer Grip Module
- Safety: Manual Thumb Safety
- Magazines Included: 2 x 10-Round Steel
What’s Included
- SIG Sauer P365 MS optic-ready pistol
- Two 10-round steel magazines
- Cable lock
- Owner's manual
Frequently Asked Questions
What red dot optics fit the P365 BXR3P optic-ready slide?
The slide is factory cut for the Shield RMSc footprint, so the SIG ROMEOZero and ROMEOZero Elite mount directly with no adapter plate. Other RMSc-pattern micro dots like the Shield RMSc and similar footprint optics will also fit. Just remove the rear cover plate and bolt your optic on.
Does this P365 MS work with higher capacity magazines?
Yes. It ships with two 10-round steel mags, but it accepts all standard P365-pattern magazines, including SIG's 12, 15, and 17-round extended options. The bigger mags add grip length, so many folks carry the flush 10-rounder and keep an extended mag as a reload.
Can the SIG P365 handle +P defensive ammunition?
It can. SIG rates the P365 for +P 9mm loads, so you can run hotter defensive ammo without worry. As with any carry gun, it is smart to test a box or two of your chosen defensive load to confirm reliability and point of impact before carrying it.
How does the manual safety on this P365 work?
It is a low-profile, frame-mounted thumb safety that mechanically blocks the trigger when engaged. It sits right where your thumb naturally rides, so sweeping it off during the draw becomes second nature with a little practice. If you learned on a 1911 or just prefer that extra layer, this is the P365 configuration for you.





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