I have a Bushnell trophy XL 1-4x24. 30 mm tube, 4A reticle with an illuminated 1 moa red dot. Not exactly compact but it sits on my AR very nicely in a forward offset mount designed for the AR.
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If you would consider a fixed low power scope you could go even smaller. The 3x Sig Sauer is a good value. Excellent reticle for fast acquisition but not too thick. Comes with an integral mount. About 160.