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After getting a Bravo Airsoft M4/M16 Metal Hop Up Chamber (see photo below) in my APS ASR106 Mini Patriot M4 airsoft rifle, I have became a believer of hop-up units that has the o-ring in the back to seal with the gearbox.
But my other APS ASR107 M4 URX Raptor rifle already have metal hop-up unit. It would be a waste to just chuck it and get another Bravo Airsoft M4/M16 Metal Hop Up Chamber. I do have tons of o-rings though. In fact, box full of them. I have tried them on the stock APS hop-up unit (see photo below).
The 10mm ID x 14mm OD x 2mm W o-ring seems to fit pretty good.
That was an easy installation and hardly cost anything. A box of o-rings is less than $10. You can get a box of one size for a few bucks at the local hardware store.
The photo above shows the hop-up unit sealed against the gearbox. The o-ring is between the hop-up knob and the version 2 gearbox. There is no contact between the o-ring and the hop-up knob. Even if there is, it would just hold the hop-up knob in place better.
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