KJ Works KP-17 Gas Version: specs, joules & FPS

Complete specs KJ Works GBB (gas blowback)

KJ Works KP-17 Gas Version, GBB: 0.78 J, 290 FPS, 780 g, 23 rounds. Full specs from the official source, with FPS for every BB weight.

Power

Energy · computed0.78 J

Velocity290 FPS88 m/s

Within Italy's 1 J limit

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

Brand	KJ Works
Model	KP-17 Gas Version
Category	Pistols
Power source	GBB (gas blowback)
Platform	G SERIES
Weight	780 g
Length	180 mm
Magazine	23 rounds
Hop-up	Adjustable

Weighs 780 g: lighter than 58% of GBB replicas in the same category in the database (466 with weight).

At 0.78 J it is more powerful than 34% of GBB replicas in the same category that stay within 1 J (351).

Similar alternatives

Same type and category, with similar power and weight.

Replica	Energy	FPS	Weight
Umarex Glock 17 Gen 5 MOS GBB (VFC G17 Gen 5 MOS)	0.78 J	290	760 g
Umarex Glock 47 Gen 5 MOS GBB (VFC G47 Gen 5 MOS)	0.78 J	290	760 g
VFC SA 226T	0.81 J	295	765 g
VFC SA 320T	0.81 J	295	798 g
ICS XMK Green Gas	0.84 J	300	780 g

Velocity with different BB weights

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

BB weight	FPS	m/s
0.20 g	290	88
0.25 g	259	79
0.28 g	245	75
0.30 g	237	72
0.32 g	229	70
0.36 g	216	66
0.40 g	205	63

Theoretical calculation at constant energy (0.78 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.