Bushnell actually has 3 different scopes in 2 configurations that offer the Tremor2 reticle, they are:
HDMR 3.5-21x 50 .1 mil clicks, 5 mils/rev no zero stop
ERS 3.5-21x 50 .1 mil clicks, 10 mils/rev with Z-Lok zero stop
XRS 4.5-30x 50 .1 mil clicks, 10 mils/rev with Z-Lok zero stop...