Californians can legally possess any AOW, except a pen gun, as long as it is possessed in compliance with federal law. Likewise they can possess any C&R listed short rifle or short shotgun.
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Eotech
The HWS is actively in use with military forces around the globe, including many special operations forces, like USSOCOM, where it is standard for close quarter, urban combat. Military units like Stryker Brigade, 10th Mountain and 3rd Infantry have chosen the holographic weapon sight as its optic of choice. It is battle proven to withstand the abuse that any harsh environment, high powered weapon platform, or military mission can dish out.