VFC Umarex HK UMP .45ACP DX: specs, joules & FPS

Complete specs VFC GBB (gas blowback)

VFC Umarex HK UMP .45ACP DX, GBB: 1.44 J, 394 FPS, 2,500 g, 25 rounds. Full specs from the official source, with FPS for every BB weight.

Power

Energy · computed1.44 J

Velocity394 FPS120 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.

Velocity declared in m/s by the source and converted to 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.

licenza Umarex; calcio pieghevole

Weighs 2,500 g: heavier than 60% of GBB replicas in the same category in the database (67 with weight).

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

Replica	Energy	FPS	Weight
VFC Umarex HK MP5K	1 J	328	2,350 g
VFC Umarex HK MP5K Early Model	1 J	328	2,350 g
Umarex Beretta PMX SMG GBB (by KWA)	0.95 J	320	2,400 g
VFC MP5 A5 V2 GBBR	1 J	328	2,830 g
VFC MP5 K-PDW GBBR	1 J	328	3,120 g

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

Theoretical calculation at constant energy (1.44 J). Real-world values can differ slightly with hop-up and replica.

Every value on this page comes from the manufacturer's official product page, checked on 2026-11-07.

Spotted a wrong or missing value? Let us know.