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Directory / Compare / P320-M18 vs P320 Full-Size
Side-by-side · Manufacturer-published fields only

SIG SAUER P320-M18 vs SIG SAUER P320 Full-Size

SIG SAUER publishes both as P320 models. Both are chambered in 9x19mm Parabellum. The P320 Full-Size is 20 mm / 0.8 in longer overall; its barrel is 20.32 mm / 0.8 in longer; both list 17-round standard magazines. One field is not comparable — weight — because the makers publish them on different measurement bases.

Computed differences06
FieldDifference
Overall length20 mm / 0.8 in (P320 Full-Size is greater)
Overall width9 mm / 0.35 in (P320-M18 is greater)
Overall heightIdentical figures
Barrel length20.32 mm / 0.8 in (P320 Full-Size is greater)
WeightNot comparable — P320-M18 publishes unloaded; P320 Full-Size publishes with empty magazine
Standard capacityIdentical figures
How these differences are computed: each is the arithmetic difference between the two published figures, and it is only shown where both sources measured the field the same way. Where a source states a measurement basis the other does not match, the row says so instead of subtracting — figures on different bases are not comparable even when the numbers sit side by side.
Size, to scale
To-scale size envelopes: P320-M18 vs P320 Full-SizeBoxes drawn from published overall dimensions at one scale, aligned at the rear. SIG SAUER P320-M18: 183 mm long, 140 mm high, 41 mm wide; SIG SAUER P320 Full-Size: 203 mm long, 140 mm high, 32 mm wide.050 mm100 mm150 mm200 mmSide · length × heightP320 Full-Size is 20 mm longerTop · length × width
  • SIG SAUER P320-M18Length 183 mm / 7.2 inHeight 140 mm / 5.5 in (magazine state not stated by SIG SAUER)Width 41 mm / 1.6 in
  • SIG SAUER P320 Full-SizeLength 203 mm / 8 inHeight 140 mm / 5.5 in (magazine state not stated by SIG SAUER)Width 32 mm / 1.25 in
Boxes, not silhouettes: makers publish a pistol's overall envelope, not its shape, so that is all this draws. Every box is aligned at the rear and drawn at one fixed scale, the same on every page of this site, so drawings compare across pages. It is not life-size on your screen.
Published fields, side by side
FieldP320-M18P320 Full-Size
ManufacturerSIG SAUERSIG SAUER
Manufacturer size labelCarryFull-Size
Directory frame classNot publishedFull-size
Chambering9x19mm Parabellum9x19mm Parabellum
Overall dimensions183 × 41 × 140 mm / 7.2 × 1.6 × 5.5 in (height: magazine state not stated by SIG SAUER)203 × 32 × 140 mm / 8 × 1.25 × 5.5 in (height: magazine state not stated by SIG SAUER)
Barrel length99.06 mm / 3.9 in119.38 mm / 4.7 in
Weight796.6 g / 28.1 oz (magazine state not stated on SIG SAUER's product page; its 2019 launch release gives the same 28.1 oz as "incl. magazine")802.3 g / 28.3 oz (SIG states "w/ Magazine" and does not say the magazine is empty)
Standard capacity17 rounds17 rounds
VerificationSource verified 2026-09-30Source verified 2026-08-12
Full records, with every value beside the source it came from: SIG SAUER P320-M18 · SIG SAUER P320 Full-Size. More from these makers: SIG SAUER.
Reference information only. Not legal, purchasing, training, carry, storage, or assembly advice. Manufacturer technical data are rounded and may change without notice. Spotted an error? Submit a correction.