Quite frankly, I believe the AK-103 is outclassed by most guns that can be made in the fabricator, especially something like the M4A1 (I will compare the AK-103 to the M4A1 through this post as I feel it is the most fair comparison)
The AK-103's stats are as followed (pre-attachments):
600 RPM
13.5 Recoil
2.7 Reload time
10 Deviation
30 Minute fabrication time
4.45 Weight