Hello wkudu,

As xausa said, these were the three action lenghts. The ZKK 600 has a magazine length of about 88 mm. Longer than the standard M98 Mauser.

By the way, xausa, do you know other supplier than Ed LaPour for a three position M70 type bolt shroud? I am very interested because seems to be Ed LaPour has stopped to make them.

Thank you!

PH