Scorpion Piston for VSR-10 with Spring Guide

The new Stalker Scorpion piston kit for the VSR-10!

Key features:

• Modular piston with adjustable weight (65 to 148 grams)
• Reduces noise in your VSR-10
• Improves joule/FPS consistency
• Adjustable air brakes with dual O-ring cuts for optimal tuning
• Short-stroke option for faster reloads (at the cost of some joules)
• Includes a 3mm thick, 40D hardness shock pad to prevent piston impact noise against the VSR cylinder head
• Shock pads in various hardnesses and sizes available (see related products)
• Optimized to work with 9mm springs and Stalker spring guides.

The piston comes with two adjustable air brakes (3.80 mm) for optimal tuning based on your setup.

• 1 short air brake (3.80 mm) — optimal for 2J and 3J+ builds.
• 1 long air brake (3.80 mm) — optimal for 2J or lower builds.

Airbrake <> Cylinder Head Compatibility:

• Action Army cylinder head = 3.80 mm airbrake
• TM cylinder head = 3.80 mm airbrake
• Laylax cylinder head = 3.80 mm airbrake
• SSG-10 cylinder head = 4.40 mm airbrake
• Other cylinder heads = measure inner nozzle diameter and select optimal airbrake

3.80 mm Airbrake for Scorpion Pistons (SKU: ST-102)

4.00 mm Airbrake for Scorpion Pistons (SKU: ST-101)

4.40 mm Airbrake for Scorpion Pistons (SKU: ST-103)

The new piston design features a slightly modified piston cup for optimal performance in VSR-10 cylinders. This cup performs reliably from 1J to 4J+.

Installation Golden Rules:

• Always apply a drop of silicone oil or grease on the cup edge for optimal joules.
• For 2.3J setups, start with the short airbrake fully unscrewed.
• For 2.8J and above, start with the short airbrake fully screwed in.
• Always properly adjust your hop-up to your BB weight and ensure straight shooting.
• Higher joules = shorter airbrake.
• Lower joules = longer airbrake.
• Start with the airbrake in a low position and gradually unscrew it until the setup is quiet.
• When you start losing joules, you’ve passed the optimal position — screw it back in slightly to regain joules and achieve the quietest setup.

Optimal setups require adjustable airbrakes because many components affect piston acceleration speed — such as BB weight, spring strength, hop-up rubber hardness, barrel length, and piston weight. We also recommend purchasing spring guide spacers to fine-tune piston weight and joule output.

Kit includes:

• 1x Stalker Scorpion 9mm spring guide (engraved with Stalker logo)
• 1x 3mm thick, 40D hardness green shock pad (cylinder head not included)
• 1x Piston cup
• 1x Aluminum piston head
• 1x C...