HPA Adapters also called Nipples from Action Army and Balystik, US type for the Tokyo Marui, KJ Works, WE, KWA and KSC.
Adapters

Balystik
Secutor / Golden Eagle Stock Tube HPA Nipple
Article code BA-HPA-SEC-US
€5,90
in stock

Balystik
HPA Connector for Tokyo Marui Gas Magazine - US version
Article code BA-HPA-GBBNIPM-US
€5,90
in stock

Balystik
HPA Connector for KJ / WE / VFC Gas Magazine - US version
Article code BA-HPA-GBBNIPK-US
€5,90
in stock

Balystik
HPA Connector for KWA Gas Magazine - US version
Article code BA-HPA-GBBKWA-US
€5,90
in stock

Balystik
Balystik Nipple for 6mm Macroline
Article code BA-HPA-NM6-US
€6,90
in stock

Balystik
Balystik EasyConnect (US Version) for Macroline
Article code BA-HPA-18M6CO-US
€8,90
in stock

Balystik
BalystiK "Y"Shape Elbow 1/8 Male 8mm macroline
Article code BA-HPA-ELBY188
€9,90
in stock

Action Army
Action Army HPA Adaptor for KJW/WE US Type
Article code CL-21723
€18,90
in stock

Action Army
Action Army HPA Adaptor for Marui EU Type
Article code CL-21721
€18,90
in stock

Action Army
Action Army HPA Adaptor for Marui US Type
Article code CL-21724
€18,90
in stock

Action Army
Action Army HPA Adaptor for KJW/WE EU Type
Article code CL/21720
€18,90
in stock

Action Army
Action Army HPA Adaptor for KWA/KSC US Type
Article code CL-21722
€18,90
in stock

Action Army
Action Army HPA Adaptor for KWA/KSC EU Type
Article code CL/21719
€18,90
in stock

Creeper Concepts
G-series / AAP01 m4 adapter GEN3 US
Article code GS-GEN3-US
€89,90
out of stock

Creeper Concepts
Hi-capa m4 adapter gen3 US
Article code HS-GEN3-US
€89,90
in stock