Re: Fair price for GAP?
Im sure GAP keeps records, give them a call and see if they can dig it up, thats the only way you are going to know for sure.
Edit: Also, Im sure there are other things GAP charged you for, like milling out the recoil lug are on the AICS, and adjusting the trigger that I didnt include in my estimate, so it could be a bit more, but no where near the price you think you paid.
Anyway, good luck.