Umarex H&K HK45 GBB - Black (by KWA): specs, joules & FPS

Complete specs Umarex GBB (gas blowback)

Umarex H&K HK45 GBB - Black (by KWA): 1.01 J, 330 FPS, 880 g, 29 rounds. Full specs from the official source, with FPS for every BB weight.

Power

Energy · computed1.01 J
Velocity330 FPS101 m/s

Above Italy's 1 J limit

Italian shops sell versions tuned below 1 J: ask the shop which version they ship.

Energy computed from the velocity with 0.20 g BBs, the standard weight manufacturers and shops use to measure FPS.

For information only, based on the source's data for this version. Not legal advice: always check current local law and the version the shop sells.

Technical specifications

BrandUmarex
ModelH&K HK45 GBB - Black (by KWA)
CategoryPistols
Power sourceGBB (gas blowback)
Weight880 g
Length200 mm
Magazine29 rounds
Hop-upAdjustable

Weighs 880 g: heavier than 62% of GBB replicas in the same category in the database (466 with weight).

Similar alternatives

Replicas of the same type and category that stay within the Italian 1 J limit.

ReplicaEnergyFPSWeight
Tanaka Works SIG P220 IC Japan Ground Self Defence Force Heavy Weight Green Gas0.98 J325900 g
G&G STP451 J328840 g
VFC 1911 Tactical Custom1 J328840 g
Cybergun CANIK SFx RIVAL GBB - Black1 J328830 g
G&G GX45 MkV1 J328930 g

Velocity with different BB weights

At the same energy, heavier BBs leave the barrel slower. Expected velocity with the most common weights:

BB weightFPSm/s
0.20 g330101
0.25 g29590
0.28 g27985
0.30 g26982
0.32 g26180
0.36 g24675
0.40 g23371

Theoretical calculation at constant energy (1.01 J). Real-world values can differ slightly with hop-up and replica.

Try other values in the joule ↔ FPS converter →

Data source

The values on this page come from the product page of the shop redwolfairsoft.com, checked on 2026-11-07. The manufacturer does not publish full specs: values may refer to the version that shop sells.

Shop product page ↗ redwolfairsoft.com

Spotted a wrong or missing value? Let us know.

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