This adapter now comes with feed lips and a gas router fitted, making it fully plug and play.
 
This adapter allows you to run HPA on your Golden Eagle M4 (and the various guns that use their base design -- if your gas mags gas router looks similar to the images below, this is the adapter for you). Note the gas router is NOT FLAT but is angled upwards slightly towards the feed lips.
 
It is easy to confuse the Golden Eagle PMAG style magazines with GHK magazines. The main differentiator is that Golden Eagle M4 gas routers are angled upwards towards the feed lips.
We utilise a very high flow valve. This has allowed us to build a far more reliable adapter that is capable of high FPS and sustained full auto.
 
A side shim system is included, which can be fitted to increase air seal (due to manufacturing tolerances between various brands of 'Golden Eagle/WA' receiver)
 
If purchasing an M4 magwell, your adapter will come with a number of shims that can be used to ensure snug fitment of your M4 magazine