[Recoil Problems]

I have five original flush choke tubes for my 391. I have not used them of late because I bought some after market extended tubes. Can anyone explain what the marks on these tubes mean.

1. ****
2. ***
3. **
4. *
5. P8 SK SP ( no stars )

 

[Scoutman 06]

I have a 390 & if Beretta hasn't changed anything, ****= IC, ***= M, **= IM, *= F & no marking= skeet. John

 

[twopipe]

that's " PB SK SP " which is skeet