Scorpion Piston - SRS + Spring Guide

The new Stalker Scorpion piston for the SRS!

Key features:

• Modular piston with adjustable weight (from ~65 to 148 grams)
• Silences your SRS
• Increases joule/FPS consistency
• Adjustable airbrakes for optimal fine-tuning
• SRS short-stroke option for faster reloads and shorter bolt pull.
• Works with Open Piston Sear

The piston includes 2 adjustable airbrakes for optimal fine-tuning according to your setup.

• 1 short 3.80 mm airbrake (optimal for 2J and 3J~ or higher).
• 1 long 3.80 mm airbrake (optimal for 2J~ or lower).

A High Joule (shiny) piston head is included for higher joule output and a lighter bolt pull.
Use lubricant for perfect results; we recommend motor oil, silicone grease, or similar. As a reference, a Rapax Lightpull Blue 2J+ spring delivers 2.2–2.3~ joules in an SRS with a Stalker SRS cylinder and a 420 mm inner barrel. The original cylinder will produce fewer joules. Results may vary depending on the cylinder used.

Golden installation rules

• Always apply a drop of oil or silicone grease to the edge of the head to achieve optimal joules.
• For 2.3J setups, we recommend starting with the short airbrake and fully unscrewing it.
• For 2.8J+ setups, we recommend starting with the short airbrake and fully screwing it in.
• Always set your hop-up correctly for your desired BB weight and adjust it to shoot straight.
• Higher joules = shorter airbrake
• Lower joules = longer airbrake
• Choose your airbrake and start low, then increase (unscrew) gradually until the setup becomes quiet.
• When you begin losing joules, you know you are just past the perfect airbrake position; screw it back in slightly to regain joules and achieve the quietest setup.
• Works best with the Stalker SRS cylinder

Good setups require adjustable airbrakes because too many parts in your rifle can change the piston acceleration speed. Spring power, bucking hardness, barrel length, piston weight, etc. We also recommend purchasing some spring guide spacers to fine-tune piston weight and spring joules.

Included in this kit:

• 1x Stalker stainless steel Scorpion spring guide (with engraved Stalker logo)
• 1x Dampening rubber to place inside the rear of the Stalker spring guide
• 1x High Joule piston head (shiny)
• 1x Extreme Silent Cup (matte finish)
• 1x Aluminum piston head.
• 1x Stainless steel piston head.
• 5x Aluminum weights.
• 4x Stainless steel weights.
• Sear made of stainless steel (15 grams)
• 2 Adjustable airbrakes (long and short)
• 1x Nut to lock the airbrake setting
• 10 O-rings for between the weights or stock to prevent the weights from loosening during play.
• 2 spring guide O-rings for SRS A2 buttpad
• Front and rear POM guide rings

Detailed information:

The Scorpion piston is a unique concept in which 6 weights form the actual body. Since the piston itself is made up of these weights, it is also possible to extend the piston with additional weights (short-stroke), which in turn reduces your cylinder volume and joule output, but makes cocking your SRS much shorter with each added weight—at the cost of joule output, which can be compensated with a stronger spring.

The piston comes with 9 body weights that are interchangeable to perfectly configure your SRS.

• 5 black anodized aluminum body weights, each piece weighs: 3 grams
• 4 polished stainless steel body weights, each piece weighs: 11 grams

Additionally, the piston also includes 2 head weight versions.

• 1x Black anodized aluminum head weighing: 7 grams
• 1x Polished stainless steel head weighing: 17 grams

List of 6-piece configurations:
(The fifth stainless steel mid-section weight is sold separately if you wish to use the full heavy steel configurations)

• SRS Scorpion 62g (1 aluminum head, 5 aluminum mid sections)
• SRS Scorpion 76g (1 aluminum head, 1 steel mid section, 4 aluminum mid sections)
• SRS Scorpion 80g (1 steel head, 5 aluminum mid sections)
• SRS Scorpion 89g (1 aluminum head, 2 steel mid sections, 3 aluminum mid sections)
• SRS Scorpion 93g (1 steel head, 1 steel mid section, 4 aluminum mid sections)
• SRS Scorpion 102g (1 aluminum head, 3 steel mid sections, 2 aluminum mid sections)
• SRS Scorpion 107g (1 steel head, 2 steel mid sections, 3 aluminum mid sections)
• SRS Scorpion 115g (1 aluminum head, 4 steel mid sections, 1 aluminum mid section)
• SRS Scorpion 119g (1 steel head, 3 steel mid sections, 2 aluminum mid sections)
• SRS Scorpion 128g (1 aluminum head, 5 steel mid sections)
• SRS Scorpion 133g (1 steel head, 4 steel mid sections, 1 aluminum mid section)
• SRS Scorpion 145g (1 steel head, 5 steel mid sections)
  This configuration requires a fifth stainless steel mid section, sold separately.

Both airbrakes are secured with a nut under the piston head against the head to keep them in place after adjustment. The adjustable airbrake is designed to fine-tune piston speed at the end of its travel to reduce cylinder air release time and minimize piston impact noise when it hits the cylinder head. A sorbo pad in the stock can still be used with this piston.

Basically, whether you like a plug-and-play piston or you are an expert who enjoys fine-tuning piston weights and airbrakes for maximum performance, the Stalker Scorpion is your best friend.

If you have any issues or questions about this or other Stalker products, visit our Stalker Owners Facebook group here:

https://www.facebook.com/groups/329589544772075/

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For more information about Stalker products, tech and build guides, visit: www.stalkerairsoft.com