Sig Sauer P320 .40 S&W
Model: 320F-40-B
Sig Sauer P320 .40 S&W
Model: 320F-40-B
Full Specifications
About This Firearm
The Sig Sauer P320 is a full-size striker-fired .40 S&W built for duty and range work. It is no longer made in this caliber, so it is a used buy. The serialized part of a P320 is the fire control unit inside it, which makes the grip module around that unit a part and not a firearm.
It holds 14 rounds behind a 4.7-inch barrel, 8.0 inches overall and 1.3 inches across. SIG lists two internal safeties on it, a striker safety and a disconnect safety, and there is no manual lever anywhere on the frame. Lifting the fire control unit out is how the pistol comes apart, which is also how a grip module gets changed. The slide is Nitron-coated stainless with no optic cut, so a red dot means paying for milling on a gun SIG no longer builds in this chambering.
If you're cross-shopping, the Glock G22 Gen5 is still in production, holds 15 rounds at 28.43 oz behind a 4.49-inch barrel and comes with three magazines. The HK VP40 has an MSRP of $949, holds 13 and rates its pull between 4.5 and 5.4 lbs. Neither of those lets the owner move the serialized part into a smaller grip module, which a used .40 P320 still does.
Best For
Strengths & Limitations
- A cracked or worn grip module is a purchase, not a trip to the factory, because the module is not the registered part.
- Both safeties are internal, so there is no lever to find under pressure and nothing to leave engaged by mistake.
- SIG describes a three-point takedown on the P320, and the pistol field strips without tools.
- SIG has moved the P320 line off .40 S&W, so magazines, barrels and spare grip modules in this chambering are used-market items.
- Holsters fit the frame and not the caliber, so holsters are easier to find than .40 magazines and barrels.
Category Rankings
How the Sig Sauer P320 .40 S&W ranks among full-size .40 S&W handguns.
Compare Sig Sauer P320 .40 S&W
See how the Sig Sauer P320 .40 S&W stacks up against similar firearms.
Ballistics Calculator
Calculate trajectory, drop, and energy for .40 S&W ammunition.
.40 S&W Ballistics →Where to Buy
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HK VP40 .40 S&W
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Smith & Wesson M&P 40 M2.0 .40 S&W
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Glock G22 Gen5 .40 S&W
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$1,599.99 |
Frequently Asked Questions
Can the fire control unit go into a 9mm grip module?
Not usefully. A caliber change needs the matching barrel, slide and magazines, so the practical reuse for a .40 unit is another .40 or .357 SIG module.
How many rounds do the magazines hold?
SIG lists 14-round magazines for the full-size .40, with 10-round magazines for states that cap them. The 9mm on the same frame takes a longer stack.
Is the frame polymer or steel?
Both. SIG calls the fire control unit stainless steel and the grip module around it polymer, which is why the two get listed differently.
Is there an optic-ready version in .40?
Not in this configuration. The cut slides SIG built for the P320 came on separate models, and finding one chambered in .40 now means searching the used market.
