Maruzen P38 Detachable GBB: specs, joules & FPS

Complete specs Maruzen GBB (gas blowback)

Maruzen P38 Detachable GBB: 0.58 J, 250 FPS, 790 g, 12 rounds. Full specs from the official source, with FPS for every BB weight.

Power

Energy · computed0.58 J
Velocity250 FPS76 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

BrandMaruzen
ModelP38 Detachable GBB
CategoryPistols
Power sourceGBB (gas blowback)
PlatformP38
Weight790 g
Length205 mm
Magazine12 rounds
Hop-upAdjustable

Weighs 790 g: lighter than 56% of GBB replicas in the same category in the database (466 with weight).

At 0.58 J it is more powerful than 9% of GBB replicas in the same category that stay within 1 J (351).

Similar alternatives

Same type and category, with similar power and weight.

ReplicaEnergyFPSWeight
Maruzen P38 (ac41) GBB0.58 J250720 g
Maruzen P38 AC40.s GBB (Black Metal Finish)0.63 J260720 g
Maruzen P38 AC40.s GBB (Stainless Finish)0.63 J260720 g
Tokyo Marui AM .450.73 J280735 g
VFC SA 320T0.81 J295798 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 g25076
0.25 g22468
0.28 g21164
0.30 g20462
0.32 g19860
0.36 g18657
0.40 g17754

Theoretical calculation at constant energy (0.58 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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