Heckler & Koch USP45 (V1) vs Heckler & Koch USP9 (V1)

Heckler & Koch publishes both as USP models. They are chambered differently — the USP45 (V1) in .45 ACP, the USP9 (V1) in 9x19mm Parabellum — so nothing below compares their cartridges. The USP45 (V1) is 6 mm / 0.23 in longer overall; its barrel is 4 mm / 0.16 in longer; the USP9 (V1) lists 3 rounds more of standard capacity; the USP45 (V1) is 117 g / 4.09 oz heavier under matched conditions.

Computed differences06

Field	Difference
Overall length	6 mm / 0.23 in (USP45 (V1) is greater)
Overall width	Identical figures
Overall height	7.5 mm / 0.3 in (USP45 (V1) is greater)
Barrel length	4 mm / 0.16 in (USP45 (V1) is greater)
Weight	117 g / 4.09 oz (USP45 (V1) is greater)
Standard capacity	3 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.

Published fields, side by side

Field	USP45 (V1)	USP9 (V1)
Manufacturer	Heckler & Koch	Heckler & Koch
Chambering	.45 ACP	9x19mm Parabellum
Overall dimensions	201 × 32 × 142.5 mm / 7.91 × 1.26 × 5.61 in	195 × 32 × 135 mm / 7.68 × 1.26 × 5.31 in
Barrel length	112 mm / 4.41 in	108 mm / 4.25 in
Weight	887 g / 31.29 oz (HK's own column heading)	770 g / 27.2 oz (HK's own column heading)
Standard capacity	12 rounds	15 rounds
Trigger pull	51 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)
Verification	Source verified 2026-08-13	Source verified 2026-08-13

Full records, with every value beside the source it came from: Heckler & Koch USP45 (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 source-backed correction.