Actually you can sneak by on CL. I sold a Mauser on there, listed as ammo pouch, then tell it is for an 8mm mauser. "Also have Mauser for sale, email for details".
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I put "This is California Legal" in my ad after they pulled it - they didn't pull it with that verbiage in there.
I feel for Ebay on this one, they are located Cali and don't want the issue of where stuff can and can't be shipped.