Constriction Guide:

U0: Cylinder
U1: Skeet/Improved Cylinder (I.C.)
U2: I.C./Light Modified (Lt. Mod)
U3: Modified/Improved Modified (I.Mod)
U4: Full/Extra Full

Muller Chokes is not responsible for incorrect choke selection. If you are unsure what choke your barrel takes, please check with a reputable gunsmith. 

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