[Hectic]

Im not fully familiar with that gun. Is it an m4 baisicly?
If so then pop out the rear body pin. Fire one or two rounds in semi and notice if the lil tip on the gearbox that connects in the hop up moves back n forth okay. If it does its not a nozzle issue.
Next is slide the inner barell and hop unit outta the upper reciver be carefull u dont loose the lil spring that rests above the barel on the front of the hop up. Inspect the hop up unit for cracks and such if it is okay hold the barell up to the light and look through it. See if the rubber inside looks torn or damaged. If u cant tell pop the C clip off the hop up unit turn the hop all the way off point the top of the unit downwards so the barrel section of the hop unit is up and the adjustment portion is down and slowly but firmly pull the barrel out of the hop up unit. Inside the hop unit is a tiny lil rubber bit called the nub that rests on the hop arm by holding the unit upside down like i said it shouldda stayed put just make sure u dont drop it out and set the hop unit aside. Now u should have the barrel with the hop rubber and a lil brass ring dont lose the ring either. Inspect the hop rubber for rips and damage u can slide it off the barrel and turn it inside out and inspect the lip that causes hop.

Befor u do that tho tell me did u use silicone lube to clean the barrel? 9r somethin bad for the rubber n plastic bits like wd40 or some solovent? It may be u melted the rubber n plastic or u could have lube on the rubber so mabe just wash it with warm soapy water and reinstall it.