Left side view of SIG P320 pistol in the M17 setup as selected by the US military.
Source: SIG Sauer - © Copyright lies with original owner
Baseline full size pistol of the P320 family. Available in four calibers. These include 9x19mm Parabellum, .357 SIG, .40 Smith & Wesson and .45 ACP. Magazine capacity differs per caliber. The P320 RX features a slide cut for mounting a reddot sight. The US military M17 service pistol is a full size P320 chambered in 9x19mm.
The Carry variant uses the same full size frame as the P320, but features a shorter slide and barrel. Available in the same four calibers as the full size P320. The P320 XCarry features a slide cut for mounting a reddot sight. The US military M18 service pistol is a full size P320 Carry chambered in 9x19mm.
The Compact variant uses the same slide and barrel length as used on the Carry, but the frame is less tall. It is available in the same four calibers as the P320 Carry, but the magazine capacity is lower for magazines that sit flush with the pistol grip.
Smallest variant of the P320 series of pistols. Compared to the P320 Compact both the slide and frame are smaller.
The M18 variant of the Modular Handgun System replaces the M11 (SIG Sauer P228) in US military service.
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