Air soft gun HopUp Airsoft

Hop up upgrade : r/airsoft

Easy Ways to Adjust Hop Up on an Airsoft Rifle: 10 Steps

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Rocket Airsoft AK Aluminum Red Metal Hopup Chamber – Airsoft Atlanta

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Easy Ways to Adjust Hop Up on an Airsoft Rifle: 10 Steps

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GHK Quick Adjust Hop-Up Upgrade Kit for M4/M16 Gas Blowback

What type of hopup would I need to upgrade the FAL? The gearbox is