A remix of the FTN.6 Rimfire files now accepts a collar Form 1 in the same manner as the FTN.5. The Elite version uses a 15 mm aluminum tube measuring 35 mm inside diameter and 38 mm outside diameter, matching the FTN.5 Rimfire size. The standard Rimfire version uses a 15 mm aluminum tube measuring 27 mm inside diameter and 30 mm outside diameter, matching the FTN.5 Rimfire Slim size.

The full FTN.6 pack contains a detailed readme at the listed Odysee address. Precut and custom engraved collars are available from the listed shop.