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 ?
