Talley Rings 30mm Browning Abolt 223 & Browning Super Short Mag - if 223 there are 2 options see below

30mm Browning Super Short Mag & 223 Abolt
30mm low #730738
Front Base = 10.5mm 
Rear Base  = 10.5mm 

30mm Browning Super Short Mag & 223 Abolt
30mm Medium #740738 
Front Base = 14mm  
Rear Base  = 14mm  

If you have a 223 please measure your holespacing for both the front mount and back mount (center to center) if it is 

• Front hole spacing: .860 inches (21.89mm)
• Rear hole spacing: .560 inches (14.22mm)

if this is incorrect and they are both .560 inches (14.22mm) you will need 720000, 730000, 740000, 750000