Maxx M4E hop chamber

Maxx M4E HOPUP CHAMBER I tried this in my gun thinking it was a simple drop in part. I then realised I will need to change my nozzle to a shorter one. I think they recommend 21.00 to 21.25 nozzle This is basically brand new and are welcome to check it out yourself first. I don't fancy opening up my gearbox unit until my gun is broken lol. It's a paper weight in my draw at this point Would prefer PayPal please