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I use to have two of the Huang EOtech knockoffs (ACM): the 557 and XPS.
They both seemed to survive recoil okay and keep zero (I use a heavier buffer so my WE M4s kick a bit harder than stock). GBBRs are awesome but the recoil is nowhere near that of a real firearm; the optics probably suffer worse shocks from the drive to the field and back.
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