Reckless Attacker and Crits

[Xyrlove Woodsoul]

The paragon feat Reckless Attacker states that you get a mba as a free action when you score a critical hit.

Firstly, is there a limit to the # of times you can get the free mba, per attack? And do the penalties from Reckless Attacker feat stack with each free mba you make? (I forget how that works)

Also, if there is no limit to the # of free mba's (other than dm discretion- like, dex mod # of times ?), then what about Coup De Graces? What happens with that action in concert with Reckless Attacker? (Or the Rampage Barbarian Feature, for that matter). Critical ad infinitum? (kidding)

Or do you have to roll a critical hit to activate Reckless Attacker? But the feat desription only says, "score" a critical hit.

 

[AbdulAlhazred]

The first time you score a critical hit with a fighter attack power on your turn, you can make a melee basic attack as a free action. If you do so, you take a –2 penalty to AC until the end of your next turn.

This is the text of the feat as of the October 2009 errata. I think it should answer your questions. You can only gain the benefit once per turn so there is no issue of recursive crits. You get an AC penalty, but it won't stack because penalties from the same source don't stack. In any case it would be fairly difficult to end up with multiple instances of the penalty as currently written.