Are you shooting steel ?

If so do you want the tubes for decoying ,mid range or pass shooting ?
Decoying Skeet or IC
For decoying -mid range IC or Light Mod
For Mid range - pass shooting light mod or Mod
Pass shooting MOD or Improved Mod

IMO order a Light Mod and patteren it with your loads ,2 tube IC ,third MOD.

You can order direct from briley.com ($34.95 per tube) or from a gunshop or from a web site .