3.55/3.91 with posi

mikedevore said

I have a 3:55, 489 case, SureGrip. I would like to trade for a 4:56 or 4:88 third member.

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I have a 4:10 489 case with spool third member if you are interested.
Is SureGrip posi or spool. I need posi.