If you plan to engage within 5 meters, you're going to need auto trigger. The semi function just doesn't cut it with its terrible 5-6 shots per second. However, the auto trig makes its terrible stability even worse. On the plus side, you get a little more flexibility all around so you won't get stomped by a rushing pointman or even a rushing rifleman. Two-shot bursts aren't recommended, but in CQC you gotta do what you gotta do
The burstfire trigger makes it impossible to use since you have to wait for the recoil/bloom to settle before firing the next burst. Plus, you're only going to hit the first shot of every burst past 10 meters and waste the other two plus the time it takes to fire those two and let it settle.
The semi function makes it usable past 10 meters, though you'll most likely be outDPS'd by contemporary spray weapons anyways. The ROF is like tapping a socom, and if you sync it wrong it jams.
End of story: it's a nerfed para with no use. Slap an auto trig on if you rush. Don't if you trust in your ability to keep your distance.