I would recommend an aimpoint with a 3x magnifier on a flip to side mount. Quality variable zoom in the 1-4x range is really hard to find for a good price. Airsoft aimpoint clones are very good (way better than EoTech clones) and although most 3x magnifiers don't have awesome eye relief it's very usable.
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JG HK416
KWA USP
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