King Arms Hopup Chamber Set for WA / G&P / King Arms M4 Airsoft GBB Gas Blowback Rifles

"Works in a GBBR MK18 Golden eagle 6mmproshop easy to install and fit easily with a inner AEG barrel but could also work with a inner GBBR barrel

"Bought this as full replacement for a G&P I bought second hand that had been really missused and poorly treated having the original hop rubber and arm broken.

At arrival I noticed this (hop up) unit's parts were not compatible with the original hop but then I found it out that it is for AEG barrels, which I really like, took an AEG G&P barrel I had laying around and installed, so far seems to be working pretty well, but be aware this is for using AEG barrels so if you don't have a pare AEG barrel, it will render your current GBB barrel useless.