Sig Sauer P320 Full-Size .357 SIG
Model: 320F-357-BSS
Sig Sauer P320 Full-Size .357 SIG
Model: 320F-357-BSS
Full Specifications
About This Firearm
The Sig Sauer P320 Full-Size is a striker-fired .357 SIG built for duty use. Sig sells this chambering as a caliber exchange kit for the P320 and not as a complete pistol. The serialized part is the fire control unit, and it lifts out of the grip module, so one registered pistol can be built in more than one caliber.
The exchange kit carries the slide, the barrel, the recoil spring and 14-round magazines, and the fire control unit stays put. The trigger breaks at 6.5 lbs, which is heavier than the 4.4 lb single-action pull on Sig's hammer-fired guns in the same cartridge. The slide is stainless in a Nitron finish, and this build has no optic cut. The barrel is 4.7 inches and the pistol weighs 29.5 oz.
If you're cross-shopping, the Glock 31 Gen4 is the other full-size striker pistol in this cartridge, 15 rounds at 26.1 oz behind a 4.49-inch barrel with a 6.3 lb trigger, and a complete gun is a used buy. The Sig Sauer P229 is the hammer-fired compact, 34.4 oz with a 3.9-inch barrel, 12 rounds and a decocker. Sig still supports this chambering through the exchange kit.
Best For
Strengths & Limitations
- One serialized fire control unit covers more than one caliber and more than one frame size, so a second cartridge costs parts and not paperwork.
- The grip module is a wear part you can replace outright.
- The kit includes its magazines, so no .357 SIG magazines have to be found separately.
- Getting the 6.5 lb pull lighter means aftermarket parts.
- No optic cut on this build, so a dot means a different slide.
- The kit route assumes you already own a P320.
Category Rankings
How the Sig Sauer P320 Full-Size .357 SIG ranks among full-size .357 SIG handguns.
Ballistics Calculator
Calculate trajectory, drop, and energy for .357 SIG ammunition.
.357 SIG Ballistics →Where to Buy
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Alternatives to Consider
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Frequently Asked Questions
What safety features does it have?
A striker safety and a disconnect safety. There is no manual safety lever on this build.
Which calibers does the P320 take?
Sig's current manual lists the pistol in 9mm, .45 Auto and 10mm, with caliber exchange kits for .40 S&W and .357 SIG.
How many rounds do the magazines hold?
Fourteen. Sig's price list gives the full-size .357 SIG exchange kit a 14-round magazine.
