Tikka T3x UPR Black Metal Bolt Action Rifle – 308 Winchester – 24.3in – T3x Ultimate Precision Rifle introduces a new kind of lightweight stock construction: the bedding features an extra layer of carbon fiber mixed with fiberglass for increased rigidity and accuracy. The stock is coated with a rough surface for the best grip in any condition and has attachments for QD slings. T3x UPR rifles are all muzzle threaded with 5/8×24 thread.