X CUSTOM HPA GBB FITTING
The ultimate upgrade to convert your gas blowback (GBB) weapon into a high-performance HPA system. This adapter directly replaces the original stock fill valve on your magazine, transforming it into a standard HPA quick coupling. CNC-machined from high-grade stainless steel to guarantee uncompromised structural strength, a perfect seal, and long-term durability.
Key Advantages
Premium Stainless Steel: Unlike soft brass fittings, our stainless steel construction withstands rough field handling and heavy, continuous line swapping.
Leak-Free Seal: Engineered with tight tolerances to ensure a rock-solid, airtight fit once properly installed into the magazine base.
High Flow Design: Optimized inner core diameter ensures consistent, unrestricted airflow to the gas chamber with every trigger pull.
Technical Specs & Compatibility
Thread Options: Available in precise thread pitches for WE / KJW, Tokyo Marui, and KSC / KWA magazines (make sure to select your specific version).
Coupler Standard: Fully compatible with standard QD Foster style remote line couplers available across our store.
CAUTION: This is a standard adapter designed specifically for use with QD Foster couplers that are not self-closing (non-self-closing).
What's Included: 1x X Custom HPA GBB Fitting of your choice with a pre-installed sealing O-ring.
FREQUENTLY ASKED QUESTIONS
DO X CUSTOM BUNDLES WORK WITH MY HPA TANK AND PLATFORM?
Yes. Our bundles and the XELTA Regulator² are designed as plug-and-play for common HPA setups across CQB to DMR. XELTA works with low-pressure and high-pressure tanks and is adjustable from 10-250 PSI. Each bundle is curated so you don't have to chase missing parts.
WHAT MAKES THE XELTA REGULATOR² DIFFERENT FROM TYPICAL REGS?
XELTA uses a dual-piston design: one piston isolates bottle pressure, the other holds your set output rock-steady—so performance feels consistent whether the bottle is full or nearly empty. It also includes cold-weather details (anti-frost considerations) and an easy-to-read, tinted gauge window.
IS THE X-HOSE³ COMPATIBLE WITH US QD/FOSTER AND WINTER CONDITIONS?
Absolutely. X-Hose³ is a premium microbore braided remote line with US-standard QD and stainless fittings. Our Cold-Ready seals keep their elasticity in low temperatures. The default bundle length is 110 cm, with up to 14 colorways available.
HOW FAST CAN I GET PLAYING, AND WHAT'S IN THE BOX?
It's truly out-of-the-box: connect the bottle ➔ set PSI ➔ verify on chrono ➔ play.
HOW MANY SHOTS FROM THE X-TANK 0.8 L (3000 PSI)?
Shot count varies based on your replica and PSI setting, but a standard setup typically yields around 2100+ shots per fill.