 The C/79 was basically a bronze barreled variant of the steel barreled 9 cm Kanone C/73 on a fortress carriage rather than field carriage.The C/79 featured a new breech which although similar to the square breech block of the C/64 had a semi-circular face which allowed the gun to avoid the stress fractures which caused catastrophic failures in its predecessor.This type of breech was known as a cylindro-prismatic breech which was a predecessor of Krupp's horizontal sliding-block and the gun used separate-loading, bagged charges and projectiles.