[sidhoch]

My son just inherited a Mossberg 500 20 gauge with 3 removable chokes from his father-in-law.
One of the chokes (suspect after market) has 3 notches on the business end of the choke and the other has 4 notches.
There is no other indication on the chokes as to which is MOD and which is IC.
Other chokes I have seen have the constriction marked on the side.

Appreciate any info regarding this subject.
Local Bass Pro Shop gun guys couldn't answer the question.

Thanks, Sid

 

[Shooting Coach]

Three notches is Modified and four is Imp Cyl.

Your Mossberg takes Winchoke, old style Browning Invector and Weatherby.

 

[Recoil Sissy]

Browning Invectors including Invector Plus are marked as follows:

one notch - full

two notches - imp. mod.

three notches - mod.

four notches - imp. cyl.

five notches - skeet

The marks on the end of Browning tubes allows a shooter to idnentify which choke is in the gun with a glance. Flush chokes marked on the side must be removed from the gun to identify.