Installation requires only a GHK 553 Gas Router (Feed Lips and Valve are provided). 

Field limits can be achieved with around 100-110PSI

THESE ADAPTERS ARE SOLD FULLY BUILT AND READY TO GO, THERE IS NO NEED FOR ANY DONOR PARTS FROM A GAS MAGAZINE

Configurations

Modular Adapter Top

This is the 'top' part of the modular HPA adapter, and is available for purchase so you can use your existing modular bases, saving you money!

M4 

Includes modular adapter top - Compatible with most M4 magazines, works best with PTS EPM1.

MP5

Includes modular adapter top - Compatible with all CYMA MP5 Mid Cap Magazines

Shotgun Shell 

Includes modular adapter top - Compatible with CYMA Shotgun Shells and some other brands

Drum Base

Allows your HPA adapter to be used with a Tokyo Marui MP5 or VZ61 drum (or a Well/Jing Gong one if you can find them). The drum itself can be purchased separately here

Modular Magwells are also available sold separately!

Modular magwells can be purchased individually here. I recommend mixing one high capacity mag-well, e.g. M4 or MP5 with a limited capacity mag-well such as the shotgun shell base, for those sites who don't like HPA adapters, or for when you want a more 'realistic' setup, while still running HPA.