The guys at Griffin Armament told me about this yesterday at the shoot. Good video showing the different setups and options for the Optimus. Its kind of painful to watch, but its still a good video.
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I had done some research the 2 weeks prior to the range day and decided on the optimus first and the liberty MysticX second. I did not see a whole lot of content on the webs for the Optimus. I looked on QRF website and seen that the optimus was out of stocked which sucked but once I got to the range and talked to Jake he said QRF had 15-20 of them in stock. I asked if he was doing a special price on them for guys at the range and he politely said the special is that he has them in stock. From talking to him and checking around the webs the optimus has been very successful they just have not been released from NFA jail yet and gotten into the owners hands.
The Liberty Mystic X has been around for a few years so alot of info on them. (owners have them in hand) I still would buy a Mystic X or Cosmic if they had end caps like the Optimus. I like the idea of be able to screw on a 22 cal end caps.