The M 03 offers a range of calibers that are divided into three groups and two, standard length options:

• Mini: 222 and 223 Rem, 60 cm (23.6”) barrel
• Standard: 22-250, 243W, 7mm-08, 308W, 6.5×55, 6.5×57, 6.5×65 RWS, 25-06, 270W, 7×64, 30-06, 8x57IS, 8.5×63 and 9.3×62 – 60cm barrel