Tikka T3 Extended magazines increase the magazine capacity of your Tikka rifle. Tikka T3 & T3X Extended Magazine, caliber.223 Rem Tikka T3 Extended extra Magazines are handy to have in your pocket when hunting or target practicing, as an empty magazine can be replaced quickly and easily by a full one. Simply slip in a full mag and you are immediately ready to chamber another round. See Technical Specifications Also compatible with.204 Ruger. Below for applicability- Caliber.223 Remington Capacity: 6 Rounds UPC: 082442811833 Beretta | Tikka T3 & T3X Extended Magazine Caliber.223 Rem in Gun Accessories.