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

Field	Difference
Overall length	15 mm / 0.59 in (USP9 (V1) is greater)
Overall width	3 mm / 0.12 in (USP45 Compact (V1) is greater)
Overall height	7 mm / 0.27 in (USP9 (V1) is greater)
Barrel length	12 mm / 0.47 in (USP9 (V1) is greater)
Weight	Not published by both
Standard capacity	7 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 Compact (V1)	USP9 (V1)
Manufacturer	Heckler & Koch	Heckler & Koch
Chambering	.45 ACP	9x19mm Parabellum
Overall dimensions	180 × 35 × 128 mm / 7.09 × 1.38 × 5.04 in	195 × 32 × 135 mm / 7.68 × 1.26 × 5.31 in
Barrel length	96 mm / 3.78 in	108 mm / 4.25 in
Weight	Not published	770 g / 27.2 oz (HK's own column heading)
Standard capacity	8 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 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 source-backed correction.