AP stands for Advance Performance. Titleist has finally introduced a game improvement iron for the low to mid-handicapper that doesn’t give up any of the Titleist “player” playability.
About Fairway Stevie
Steve Waxman has hob nobbed with some of the music world's biggest stars for the past 20 years. He's that single player that has joined your group on Saturday or Sunday mornings and has found a way to drop the names of Madonna, Phil Collins or Kiss sometime during the round. 
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[...] Go watch Fairway Stevie at the Titleist Fitting Centre. [...]
I just purchased my AP1 irons at a golf town demo sale I am a 15 H/C
Due to the time of year i managed to only get in 2 rounds which I shot a 78 & 83 @ 2 different golf courses . I spend mar & april in HH and can wait to use them again .
I am 65 years old and with these clubs i added 20 yards to my shots with my 4 to 9 irons I feel like I am 30 again and a 9 h/c
My former clubs were Ping Zings