HPA Adaptors

HPA pistol adaptors convert a GBB pistol to run on external air. Cold-weather consistency, no gas, no slide-lock under rapid fire — the upgrade path for any GBB sidearm you want to keep playing year-round.

A GBB pistol uses green gas, propane, or CO2 stored in the magazine to drive the slide. That works well in warm weather but starts failing below ~10°C — gas pressure drops, slide cycling becomes inconsistent, and rapid fire causes "cool-down" where the gas chills the magazine and FPS falls off shot by shot. An HPA adaptor solves this by replacing the gas magazine with one that takes a regulated air line from your tank instead.

Adaptors are platform-specific — a Hi-Capa adaptor doesn't fit a Glock and vice versa. The most common UK fitments:

Hi-Capa (Tokyo Marui and the wide range of TM-compatible clones — see the Hi-Capa Series)

Glock (TM Glock and licensed equivalents) also Action Army AAP-01 (the carbine-convertible duty pistol)

An adaptor on its own won't run a pistol — you'll need an HPA tank, regulator, and line (a 13ci compact tank works well for pistol-only setups). If you already run an HPA primary, the same tank, regulator, and line can swap to the pistol with a quick-disconnect fitting. For a purpose-built HPA pistol rather than an adapted GBB, see the Gate PTX.

💡 Titan Forge tip: The HPA Pistol & GBBR Starter Bundle pairs any pistol adaptor on this page with the tank, regulator, and line needed to run it — saves working out which fittings match and gets you running on one order.
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