This is a Tikka factory replacement magazine. Tikka T3 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. Fits in gun chambered for Calibers: 25-06 Rem, 6.5x55 Swed Mauser, 270 Win, 30-06 Sprg, 7mm Rem Mag, 300 Win Mag, 338 Win Mag Note: 5 round capacity will fit 4+1 in the following calibers: 7mm Rem Mag; 300 Win Mag; 338 Win Mag