This is a Fobus Case known as the Paddle, model CU9G.
Excellent for on the job concealed carry. Adjustable tension design to accept most magazines and chain handcuffs. Custom retention" lightweight and low profile design.
Features:
One-piece pouch body
Low profile design for concealability
Passive retention allowing rapid presentation
Rubberized paddle backing for extra stability and comfort
Reinforced rivet attachment