Been searching for these for a while with no luck but recently got notice that a year old Optics Planet order was in stock. About same time several showed up on GB and I got one not confident given the back and forth w/ OP. So naturally ended up w/ four of them and not a one will thread on any FAL barrel I've got. Anyone else get some recently and have problems? Aren't they supposed to be 9/12x24 LH?