This is something I found out on Marrakesh last night. The original A33 rifle (that the guards use) has a higher rate or fire but a wider aiming reticule than the version (A33H) you can unlock in game. I found that strange, that the version you could unlock seems to have gotten an accuracy buff, but other properties of it has been altered.
I find that odd because when the AR552 was made unlockable, it seems that all properties of it were unaltered from when you could take it on the Mendoza level.
Just seems a bit odd that they’d alter the properties of one, but not any others to my knowledge.