The GarminA(R) Xero C1 Chronograph is here - and it's really great. One of the key selling points of the unit is its size, so when Area 419 got one they immediately wanted to be able to mount it to the rifle. The ARCALOCK Arm for the XeroA(R) C1 allows you to take advantage of all of the unit's versatility, mounted either on the bottom of your rifle or the top. The arm allows you to mount the unit in-line with the barrel via diving board or side-mount, or offset from the rifle with an ARCA rail or elongated pic rail. The arm can also be removed from the rifle and attached to any tripod with an ARCA head for stationary use. The mounting 17S mounting pattern al Mfg: Area 419