I've got a player running an archery based fighter. The whole inspiration for this character was the buckler, which he firmly and staunchly believes gives him a +1 to AC even when using his bow. I, the DM, believe he is wrong in his interpretation of the (admittedly poorly worded) buckler rules and has to give up his AC bonus on the turn he fires the bow.
Now, I don't want this thread to be a rules debate. We've played about 5 sessions. I brought up that we've been doing this wrong. He has basically said this ruins the character and the fun for him. I see a few ways to possibly deal with this.
Let him have it - You didn't catch it when he made the character. Let him know I won't rule this any other time, but I'm keeping it for consistency. It won't get too gamebreaking until it becomes magical.
Hard, firm "No" - I'm the DM, so I win. Feels like a jerk move after he's been playing with the character a while, but those are the rules and whether or not to keep playing it is his choice.
Improved Buckler Defense - An old feat from 3.5 that isn't technically in Pathfinder, but it can be shoehorned in, makes the character work. It's a bit of a win-win compromise.
Any thoughts on these or something else I haven't considered?