DIY gel blaster hopup?

Has anyone made their own hopup?

I thought I saw one made from copper tubing somewhere.

Yep, I fitted one internally to a Desert Eagle. Used foam from a gardener’s knee pad. Glued into the whit plastic extension at front. After fiddling with internal size it works a treat on standard milkys.
Fabricated a alloy Suppressor for the G36 V2 using brass tube for the internal hop-up and it is straightline accurate for 15m. Plunging fire range of 25m with milkys. This is tested holding the gun horizontally level.

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