In an alternative twist of history. Germany was not defeated in WW2. The world has changed. See description for more info, and backstory.
When the QJZ-335 Anti-tank rifle was designed. It was originally intended for a two-man team. However, mass production led to many rifles being wasted as surplus. Marshall Xu decreed, "We have the men, we will not waste the weapons." New doctrines were hurriedly written and the rifle design was modified to allow for one person's carriage. The men who carry these monstrous rifles go through rigorous strength training to deal with the immense weight of the rifle. Weighing some 9kg unloaded, the rifle was deemed too inaccurate to fire from the shoulder. As such, the weapon can only be firing from a prone position with bipod support. The 23mm projectile fired from the rifle can pierce through almost all but the thickest armour due to its unique terminal ballistic properties. In fact, the holes it created during test firing at 100mm steel plates were near identical to those created by the 45mm AT gun in service at the time. Hence, the rifle was named "45mm AT rifle" in order to confuse and demoralise enemy tank operators. The AT rifleman is also capable of concealing himself from the enemy, having gone through the same training as all other conscripts. However, like the conscript rifleman, he does not make use of combat experience learnt during deployment and as such will not receive battlefield promotions.