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This model 91520 should be the older model that was discontinued in 2018 while the newer one is 91531. The easiest way to tell should just be checking what magazine release yours has. The older model has an ambidextrous one with a button on both sides where the newer model has a single button that can be swapped to the desired side.

Hilton, you can verify this directly with CZ-USA at 1-800-955-4486 or Phone: (913) 321-1811 -- Representatives available Mon-Fri 9am-4pm Central Extension 4701