KTW Ithaca M37 Riot Slug Spring Shotgun: specs, joules & FPS

Complete specs KTW Spring

KTW Ithaca M37 Riot Slug Spring Shotgun: 0.78 J, 290 FPS, 2,540 g, 72 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

BrandKTW
ModelIthaca M37 Riot Slug Spring Shotgun
CategoryShotguns
Power sourceSpring
PlatformM37
Weight2,540 g
Length1,020 mm
Magazine72 rounds
Hop-upAdjustable

Weighs 2,540 g: heavier than 82% of spring replicas in the same category in the database (17 with weight).

At 0.78 J it is more powerful than 62% of spring replicas in the same category that stay within 1 J (13).

Similar alternatives

Same type and category, with similar power and weight.

ReplicaEnergyFPSWeight
G&P M870 RAS Tactical (Shorty)0.84 J3002,550 g
Maruzen CA870 Tactical II Shotgun0.73 J2802,230 g
Maruzen CA870 Tactical III Shotgun0.73 J2802,230 g
Tokyo Marui SPAS-120.75 J2852,000 g
G&P M870 Sheriff (Medium)1.01 J3302,740 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 g29088
0.25 g25979
0.28 g24575
0.30 g23772
0.32 g22970
0.36 g21666
0.40 g20563

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.

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