Ultimate SRS Upgrade Kit (420mm Barrel 3.0–3.5 Joules)

The Ultimate Stalker Upgrade Kit to turn your Silverback SRS into a true sniper beast. This upgrade kit makes your SRS accurate, consistent, and silent! Load up your magazines and dominate the field like never before.

The package includes the following Stalker upgrades:

• Stalker SRS Kraken Hop-Up Chamber - Ultimate Edition
• Stalker SRS Scorpion Piston - Ultimate Edition
• Stalker Morpheus 420mm Inner Barrel
• Stalker SRS Fluted Teflon Cylinder
• Stalker Official Logo Patch

We strongly believe that Rapax springs are the best springs on the market. The results achieved with these springs and the Stalker upgrades are outstanding.

• Rapax RMS 3+ Spring (includes tensioners to increase FPS/Joule if needed.)

*Note: This upgrade discount is only available when all products are in stock. Click "Add to Cart" — if all products are visible, you can purchase this kit with the mentioned discount. If you see a blank page, it means one of the products is currently unavailable.

Product Descriptions:

Kraken Hop-Up Chamber

• Easy setup for both experienced and new players (~2-minute bucking swap)
• 100% self-alignment system for a perfectly straight setup
• 100% straight / 100% seal patented Kraken bucking
• Adjustment wheel head cut-out for easy tuning
• O-ring guided adjustment wheel
• Custom-made steel hop arm screw
• Laser-engraved white lettering and text
• Front O-ring to prevent BBs from falling into the receiver
• Modular chamber design compatible with most VSR buckings, bridged/unbridged barrels, and nubs
• Modular arm section compatible with S1, S2, and S3 arms
• V-groove island for upper outer barrel screw (SRS A1)
• V-groove for lower outer barrel screw (SRS A2)
• Side flat body cutouts for future Stalker products
• Quick setup for easy barrel or bucking changes and barrel cleaning
  

SRS Scorpion Piston

The Stalker Scorpion piston features an extremely modular design developed from scratch. It offers all the options players could want for their SRS piston. This unique concept uses six weights that form the piston body itself. Because the piston is constructed from these weights, it can be extended with additional weights (short-stroke configuration), which reduces cylinder volume and joule output.

Morpheus 420mm Inner Barrel

The Morpheus Hybrid Barrel is made from highly durable SUS304 stainless steel and features a dual-bore tapered end crowning to enhance both range and accuracy.

We selected stronger, more durable SUS304 seamless steel to raise the performance standard. Most brands use SUS303 seamed steel because it is easier to machine. However, SUS303 stainless steel has reduced corrosion resistance due to its machinability-focused composition. The SUS304 steel we use is more difficult to machine but significantly more durable and offers superior corrosion resistance.

Fluted Teflon Cylinder

This cylinder is a Teflon fluted version of a standard cylinder and gives your SRS A1 or A2 an aggressive look. The internal coating is applied using a cold treatment process, ensuring the cylinder maintains perfect straightness—unlike many heat-treated cylinders. In addition to enhanced aesthetics, the special inner coating improves energy transfer with the piston and may increase joule output when paired with a properly sized piston cup.

• Fully compatible with Silverback SRS A1 and A2 receivers
• Thread compatible with both A1 and A2 bolt handles
• Compatible with aftermarket pistons

Rapax 3J+ RMS Spring

The Rapax Modular Spring (RMS) series is manufactured to the same high-quality standards as the Light Pull series. Built for durability and performance, it delivers an outstanding sniper experience. Compared to the Light Pull series, the RMS spring is significantly shorter, slightly harder to pull, and provides quieter shots. RMS springs are also electrically coated to prevent rust, ensuring smoother operation on the spring guide.

If you have any issues or questions about this or other Stalker products, please visit our Stalker Owners Group on Facebook here: https://www.facebook.com/groups/329589544772075/

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For more information about Stalker products, tech & crafting guides, please visit: www.stalkerairsoft.com