What hop up units fit my kwa qrf mod 1?

[Spookygamer1991]

Is it proprietary ?

okay here’s the deal

this is stressing me right out

i have a kwa qrf mod1 and I have changed the lower receiver to a kwa rm4 m4 lower so that I can run my standard m4 aeg mags

and now the stock hop unit is too short on the qrf which creates feeding issues so I bought a basic plastic m4 rotary hop from eBay and now it’s too tall on the top and won’t slide into place 

so I don’t want to have to order from kwa becuase the tax and shipping is a lot on a basic stock hop unit I need help ?

 

[Speedbird_666]

Allegedly the Maxx ME is KWA compatible.

Not cheap though. And airsoft, being airsoft, means that there's no guarantee that it's a drop-in fit even if it says it should.