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Directory / Compare / USP45 Compact (V1) vs USP9 (V1)
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Heckler & Koch USP45 Compact (V1) vs Heckler & Koch USP9 (V1)

Heckler & Koch publishes both as USP models. They are chambered differently — the USP45 Compact (V1) in .45 ACP, the USP9 (V1) in 9x19mm Parabellum — so nothing below compares their cartridges. The USP9 (V1) is 15 mm / 0.59 in longer overall; its barrel is 12 mm / 0.47 in longer; the USP9 (V1) lists 7 rounds more of standard capacity.

Computed differences06
FieldDifference
Overall length15 mm / 0.59 in (USP9 (V1) is greater)
Overall width3 mm / 0.12 in (USP45 Compact (V1) is greater)
Overall height7 mm / 0.27 in (USP9 (V1) is greater)
Barrel length12 mm / 0.47 in (USP9 (V1) is greater)
WeightNot published by both
Standard capacity7 rounds (USP9 (V1) is greater)
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. Differences marked ≈ involve at least one figure this directory converted between unit systems, so the difference is no more precise than that conversion.
Size, to scale
To-scale size envelopes: USP45 Compact (V1) vs USP9 (V1)Boxes drawn from published overall dimensions at one scale, aligned at the rear. Heckler & Koch USP45 Compact (V1): 180 mm long, 128 mm high, 35 mm wide; Heckler & Koch USP9 (V1): 195 mm long, 135 mm high, 32 mm wide.050 mm100 mm150 mmSide · length × heightUSP9 (V1) is 15 mm longerTop · length × width
  • Heckler & Koch USP45 Compact (V1)Length 180 mm / 7.09 inHeight 128 mm / 5.04 inWidth 35 mm / 1.38 in
  • Heckler & Koch USP9 (V1)Length 195 mm / 7.68 inHeight 135 mm / 5.31 inWidth 32 mm / 1.26 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
FieldUSP45 Compact (V1)USP9 (V1)
ManufacturerHeckler & KochHeckler & Koch
Chambering.45 ACP9x19mm Parabellum
Overall dimensions180 × 35 × 128 mm / 7.09 × 1.38 × 5.04 in195 × 32 × 135 mm / 7.68 × 1.26 × 5.31 in
Barrel length96 mm / 3.78 in108 mm / 4.25 in
WeightNot published770 g / 27.2 oz (HK's own column heading)
Standard capacity8 rounds15 rounds
Trigger pull51 N / ≈11.47 lb (double-action); 20 N / ≈4.5 lb (single-action)51 N / ≈11.47 lb (double-action); 20 N / ≈4.5 lb (single-action)
VerificationSource verified 2026-08-13Source verified 2026-08-13
Full records, with every value beside the source it came from: Heckler & Koch USP45 Compact (V1) · Heckler & Koch USP9 (V1). More from these makers: Heckler & Koch.
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.