Talley Rings 1" Browning Abolt 223 & Browning Super Short Mag - if 233 there is 2 options see below

1" Browning Super Short Mag & 223 Abolt

Low #930738
Front Base = 10.5mm 
Rear Base  = 10.5mm 

Medium #940738
Front Base = 13mm 
Rear Base  = 13mm 

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 920000, 930000, 940000, 950000