Easy set up - Safariland Quick Locking System Kit Model 4, Locking w/ 2 Receiving Plates

The package arrived and appeared sealed. The kit 4 offers the QLS22L which has an added locking feature that doesn't release with just squeezing the tabs. It requires a little more manipulation. It's a plus for security but not if you want it to release easily. I think it's fine if you are using it for duty.