Looks like Garmin will be getting into chronos, they were testing it out at the GAP grind PRS shoot, let a bunch of people try it out. Thread on Sniper's Hide had a guy from Area419 talking about it, possibly 600US, but, not much more info yet, Garmin was apparently surprised by the orders they got, which is still sort of in the pre-order stage for vendors apparently, no ETA on shipping yet, no official release yet. May see a pre-Xmas release? If Garmin gets it right, appears maybe they did, could be a good unit to take a look at, can be gun mounted also, although that may be an Area 419 accessory, pic or Arca mounts will be avail. No real info on muzzle break or suppressor interference to signal, they said it worked great, but no info what it was mounted on altogether, said no interference from other shots on the line. Blurb on it starts at about the 5 min mark on the vid;
https://www.youtube.com/watch?v=UJTZM9qbCzE