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Hi Daniel, ST designates Steel Receiver, and 1,2 , or 3 designates receiver size. CZ 600 ST1 - steel receiver mini size (223 Rem, 7,62x39 etc.) CZ 600 ST2 - steel receiver medium size (308 Win, 6,5 Creedmoor etc.) CZ 600 ST3 - steel receiver long size (30-06 Sprg, 300 WM etc) . Going further - CZ 600 AL1 - aluminium receiver mini size CZ 600 AL2 - aluminium receiver medium size CZ 600 AL3 - aluminium receiver long size . Stay safe & have a great Memorial Day weekend!

Hi Daniel and welcome. ST = Steel Receiver and the 2 = the caliber receiver size. In this case 2= steel receiver medium size (308 Win, 6,5 Creedmoor etc. Cheers, stay safe and enjoy!

Steel receiver.

The ST= "Steel" The 2 = receiver medium size (308 Win, 6,5 Creedmoor etc.)