Which rifle is this kit for? The listed platform is the Silverback TAC-41. Do not assume compatibility with SRS, VSR rifles or other platforms merely because it uses GBB/VSR-style buckings.

Can I use an AEG-style inner barrel? The listing requires a GBB-style inner barrel. A barrel must provide the required GBB-style interface; a standard AEG-only interface is not the listed fitment.

Is a bucking included? Yes, a Stalker Double Fin SR-Hop 60° bucking is listed in the kit.

Do I need the Kraken cylinder head? Yes. The included Kraken TAC-41 cylinder head is specified as required for this chamber.

Which air brake is specified for a Scorpion piston? The existing listing specifies the 4.00mm Scorpion air brake, sold separately. The 3.80mm stock-cylinder-head brake is not the specified match.

What changed in V2? The redesigned wheel section accepts the stock Silverback metal-ball clicker system. The listing also describes non-click adjustment for fine tuning.

V2 TDC hop-up chamber for Silverback TAC-41, compatible with the stock Silverback metal-ball clicker system. Clicked and non-click adjustment options. GBB/VSR-style bucking interface. Enclosed nub compartment design.

Requires a GBB-style inner barrel and the included Kraken TAC-41 cylinder head. The existing listing recommends a Morpheus Hybrid Barrel.

Included: hop-up body, TDC wheel, flat TDC nub, square spacer, two different under-wheel O-rings, Stalker Double Fin SR-Hop 60° bucking, Kraken TAC-41 cylinder head with front/rear rubber anti-shock pads, cylinder-head O-ring and two flat locking screws.

Cylinder-head nozzle inner diameter: approximately 4.00mm. The specified 4.00mm Scorpion piston air brake is sold separately.

Brand: Stalker Airsoft Designs. Platform: Silverback TAC-41. Version: V2. Hop adjustment: TDC, with stock Silverback metal-ball clicker compatibility and non-click adjustment option. Bucking format: GBB/VSR style. Included bucking: Stalker Double Fin SR-Hop 60°. Required barrel format: GBB style.

Included cylinder head: Kraken TAC-41, with front/rear rubber anti-shock pads and approximately 4.00mm nozzle inner diameter. Scorpion piston air brake: specified 4.00mm version, sold separately.

STALKER Kraken TAC-41 TDC Hopup Chamber Installation Video Short

Stalker Tac 41 Kraken Hopup Review and Installation!

• Silverback TAC-41 Upgrade Parts: The Complete Guide

What makes this hopup different and how does it work?

The design of the Kraken Hopup and Kraken TAC-41 Cylinder head is made in such a way that the BB is placed perfectly in the right place on the bucking patch, giving your TAC-41 the most consistent hop, leading to more range and accuracy. In addition, the cylinder head is supplied with 2 pads, which reduces the sound of contact between the cylinder and the hopup unit. Which makes your TAC41 just a little quieter.

The design of the Kraken TAC41 hopup unit makes it impossible to misalign the hopup between the hopup unit and the bucking/outer barrel. The hopup unit has 2 cutouts that work perfectly with the Stalker TAC41 Double Fin SR hop buckings. The complete hopup avoids wobbling with the square barrel spacer and 2 locking screws. The main body of the hopup has a raised lip under the wheel to prevent water from entering the TDP nub compartment.

Installation instructions/requirements:

You must have a GBB style barrel to install the Stalker Kraken TAC-41 TDC hopup unit, which can be any length you require.
Always make sure you don't have to force your bolt kit forward, if your bolt kit cant be pushed down into your lug socket, you didn't grind the bolt kit screw enough'(check video), your cylinderhead is not closed on the cylinder, or your cylinder head front rubbers are not installed deep enough.

1. Disassemble your TAC-41 as described in the Silverback manual.
2. Unpack your Stalker TAC-41 TDC hopup unit.
3. Install the stock Silverback ball plunger clicker pin to get wheel clicks or you can choose to leave this clicker ball out and install one supplied little O-ring onto the hopup wheel portion of the main body (small O-ring).
4. Install the Stalker TAC41 Double Fin SR-hop Bucking on your GBB barrel.
5. Slide the main body of the hopup unit over your bucking.
6. Slide the square spacer over the inner barrel with the arrow pointing to the end of your inner barrel in the hopup.
7. Install the screws through the main body of the hopup unit and through the barrel spacer to lock everything in place. (Choose the correct screws for your inner barrel and do not over tighten the screws as this may damage your copper inner barrel).
8. Place inner barrel + hopup in your outer barrel, making sure your spacers are far enough away from the hopup unit (towards the exit of your inner barrel).
9. Place the Flat TDC Nub with the concave shape towards the bucking.
10. Place the wheel gently on the hopup pillar to push the ball bearing inside, now push with your pointing finger in top of the stalker logo, nog gently turn the wheel Clockwise until the hopup thread accepts the wheel thread, DO NOT OVERTIGHT, turn the wheel gently at all time, if it doesn't go by itself, unwind and try a different position of the weel. now Install the hopup wheel onto the main body of the hopup unit.
11. Disassemble your cylinder and replace the cylinder head with the supplied Stalker cylinder head.
    The package contains 2 O-rings that fit around this head, make sure your cylinder seals properly, otherwise install the thicker O-ring.
12. Attach the supplied rubber anti-shock pads to the front of the Stalker cylinder head by removing the 3M tape and placing it in the recesses.
13. Glue the rubber anti-shock pad to the back of the cylinder head with a few drops of instant glue.
14. Remove the bolt/screw attached to your original bolt knob, this may be necessary if your bolt does not close properly.
15. Install the cylinder with all parts.
16. Reassemble your TAC-41 as described in the Silverback manual.
17. Load your TAC-41 and turn the wheel clockwise to increase your hop setting or counterclockwise to decrease your hop setting.
18. Have a big smile, you're ready to rock the field!

About Stalker
After good success with the release of the SRS Kraken hopup chamber, Stalker decided to also create a hopup chamber for the Silverback TAC-41. This design is another creation from the mind of Stalker. With his designs he tries to take the community into account and fulfill all the wishes of the players, and he does everything he can to incorporate his knowledge as a certified gunsmith, airsoft player and fan of the Silverback airsoft line-up. That's why Stalker products are easy to set up and work like a charm.