Rocket Airsoft CNC Aluminum Air Nozzle for Airsoft AEG Gearboxes (Type: M4 / Double O-Ring)

"The double o-ring version is nice. Fit my Lonex cylinder head properly and seals great. Only gripe is that it was a bit too long for my hopup chamber so I had to file it down a bit to get it to feed. Overall, it’s a good part at a fair price.

"Seals better than maxx nozzle on some cylinder heads and is cheaper

"Be careful on length of nozzle. Says 21mm so I figured it wouldn't be too big a difference considering my stock polymer non o-ring nozzle I was replacing was 21.1mm. Measured with my digital caliper and the nozzle came in at 21.45mm..........my mag that came with my gun does not feed properly anymore but luckily my EPM-1 mag still feeds good.