This is already a bad idea, officers ranked corporal and above get access to a better arsenal due to their outstanding performance as an officer, they've proven themselves worthy of being an officer who is responsible and can deal with situations accordingly.
I have one message to all officers, stop rapid firing. You miss all your shots in an instant, tap fire for highest accuracy at range. When you one versus one an AK47 and you with a Beretta M9 or WaltherP99 You have a very high chance of winning if you tap.
Also, no. No more weapons, the shotgun is already a powerful tool enough during situations, use it correctly.
Not to mention, senior officers get access to the Glock 20, if that helps.