SIG Sauer P365

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SIG Sauer P365

The SIG Sauer P365 High-Capacity Micro-Compact is a polymer frame striker-fired semi-automatic pistol manufactured by SIG Sauer and intended for everyday carry. It is chambered in 9×19mm Parabellum and is rated for +P (higher pressure) ammunition while utilizing offset double-stack magazines. It is offered with Tritium XRAY3 Day/Night Sights and two 10-round magazines; one flush fit and the other with an extended finger tab. The P365, which replaced the P290RS, is produced in Newington, New Hampshire.


The P365 redefined what a concealed-carry pistol should be. Now, the new P365 XL ROMEOZERO is doing it again. The perfect balance of micro-compact concealability with full-size shootability, the P365 XL ROMEOZERO packs 12 + 1 or available 15 + 1 capacity in a micro-compact, highly concealable size. Sight radius is improved with an extended 3.7” slide and barrel, and the new 365 XSeries grip module ensures a more comfortable grip and boasts an integrated magwell.


These features, along with the signature XSeries flat trigger, all come standard with a ROMEOZERO 3 MOA optic installed and ready to go right out of the box. The P365XL ROMEOZERO maintains the crisp, clean P365 trigger pull that compliments the inherent accuracy improvement of a red dot-equipped pistol. Never has so much versatility and capability been squeezed into such a perfectly concealable size.


*Includes patented optic cut technology designed by ZEV Technologies. Patent number: RE47335.


The P365 is a striker fired, short-recoil handgun with a stainless steel slide, treated with a black Nitron finish, and a polymer frame. The slide has serrations on both front and back for easy slide manipulation. The polymer grip accepts a double-stack 10-round, 12-round, or 15-round magazine. The magazine is released by a triangular button on the grip located at the undercut trigger guard section. Per SIG Sauer, the P365 has the lowest bore-axis ratio of any handgun currently made.

Sights are green tritium three-dot night sights that are made of steel and are capable of being used to cycle the slide in the case of one handed use being necessary. Aiming is by combat sighting. A proprietary rail is located below the barrel. Both red and green lasers and a light will be offered as accessory items for this proprietary rail. Adapters to convert the propriety rail to a standard rail for use with standard rail accessories are also available.

Disassembly requires no tools and does not require that the trigger be pulled. For Massachusetts Attorney General compliance requirements, a model with a manual safety and loaded chamber indicator is available. In May 2019, the P365-MS, a model with a manual safety, was made generally available.


The grip encloses a stainless steel fire control unit (FCU) similar to that in the SIG Sauer P320. Due to drop-safe issues with the P320 in 2017, the P365 was drop tested over 500 times using an enhanced testing protocol which dropped the pistol at different angles from varying heights to ensure that no such problem would occur.

The striker firing system is nearly identical to that in the P320. The short recoil locking system is the SIG Sauer System created by SIG Sauer in 1975 for a Swiss Army contract by the then-existing Swiss Industrial Group (Schweizerische Industrie Gesellschaft, SIG). The SIG Sauer System improved upon the Petter-Browning system used in the French Modèle 1935A, which SIG had licensed from SACM in 1937 and used in the SIG P210 handgun design, but is not the same system, having been considerably improved upon.

Compared to the SIG Sauer P290, the P365 is slightly larger and has a lighter striker trigger pull of 5.5 to 6.5 lbf (24 to 29 N) versus the P290 at 9 lbf (40 N). The P290RS has a restrike capability, but also has a long double-action only trigger pull. The takedown system is similar to that of the P320, in that a lever is turned down with the slide locked back to release the slide from the frame.

A P365 with its optional 15 round magazine is 0.46″ taller than a Glock 19 with its standard 15 round magazine.

P365 XL

In June 2019, the P365 XL was released. It utilizes the same fire control unit (FCU) as the P365, while having a larger grip module that accepts 12-round flush magazines, a flat trigger, and a longer slide and barrel. The rear sight on the P365 XL slide is removable, to allow a red dot sight to be attached. The slides and frames of the variants are interchangeable; for example, the longer slide (and barrel) of a P365 XL can be used on a P365 frame and vice versa.


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