The MP5K is functionally similar to its full-sized cousin, it has the same rate of fire, almost identical recoil, but a slightly higher damage. The good controllability of the gun makes it decently strong, however it does have the disadvantage of not being able to equip a grip.
The MP5K has a 3-round burst option despite being modelled with the S-E-F trigger group, which only has semi-automatic and fully-automatic fire modes.
In reality, it would be extremely awkward to perform a tactical reload on an MP5K, due to the way the bolt was designed. The bolt rides directly on top of the feed lips of the magazine, blocking a full magazine's entry into the magazine well. This prevents a fully loaded magazine from properly being seated if the bolt is in battery. This is why it is recommended that the bolt is to be locked back during tactical reloads, or a partially full magazine to be inserted. Either way, a 30+1 capacity would be extremely difficult to achieve in real life.