Product details

This kit removes all stock hopup parts and replaces them for a TDC hopup function on the stock AAP-01 hopup chamber.

This set contains a (ABS) printed TDC Hood with a grub screw and a special design pressure plate for your AAP-01 to adjust your hopup from the top with a hex key.
The vertically finished grub screw presses vertically on the included prowler hop plate and thus gives the best pressure point from Top Dead Center(TDC).

The CNC red aluminium Prowler nub on this hop plate has the same shape and finish as the well known purple prowler nub that we offer in the SRS Kraken series. This nub shape has received very good feedback, therefor we offer you the same shape for a perfect setup in your AAP-01.

Features

What's in the package?

  • 1x Acrylonitrile Butadiene Styrene (ABS) plastic AAP-01 TDC Hood
  • 1x Flat bottom adjustment grub screw
  • 1x CNC red aluminium prowler hop Plate



Installation Guide

  1. Disassemble the hopup unit from the AAP-01 pistol.
  2. Disassemble all stock parts from the stock black hopup.
  3. Keep the 4 stock screws that hold the 2 hopup halves together.
  4. Put the parts that are not used in a zippy bag and store it.
  5. Install your barrel and bucking in the hopup and close the hopup.
  6. Tighten the bottom screws and the top right screw in the hopup evenly.
  7. Take the screw that's left and put it in the TDC hood hole next to the stalker logo.
  8. Hand tight the screw (without too much power), it will use the thread of the stock hopup unit.

Now you need to drill a hole in the Upper of the AAP-01

We have a TDC Stalker TDC placement tool if you are unsure where to drill the hole to align properly with the TDC.

Skirmshop USA – Frequently Asked Questions

Please view our FAQ page for more info.

How long does shipping take?

Most orders ship within 1–2 business days from our Florida warehouse.

Typical delivery times:

United States: 2–5 business days
International: 7–21 business days depending on location and customs processing.

Once your order ships, tracking information will be emailed.

Do you ship internationally?

Yes. Skirmshop USA ships worldwide.

International customers are responsible for any import duties, VAT, or customs fees required by their country.

Do you offer preorder products?

Yes.

Some specialty items we carry — including limited runs or hard-to-import gear — may be offered as preorders when inventory is in transit.

Preorders allow customers to reserve items before the shipment arrives. Contact us to coordinate.

What is Skirmshop USA’s return policy?

Customers may return eligible items within 14 days of receiving their order. Items must be returned:

  • Unused
  • In their original condition
  • In the original packaging when reasonably possible

Items should only be handled as necessary to inspect the product.

Full details can be found here: https://skirmshopusa.com/policies/refund-policy

What does Skirmshop USA specialize in?

Skirmshop USA focuses on high-performance airsoft equipment and concealment systems designed for players who prioritize stealth, mobility, and modular gear setups.

We specialize in:

  • Stalker ghillie systems
  • concealment gear
  • premium airsoft platforms
  • upgrade components and accessories

Our goal is to help customers build complete systems that work together, not just individual products.

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