I've seen a lot on here about safety (not complaining- it's very, very important with any firearm), but not a whole about choosing who works on the weapon when it goes down or has modifications. http://www.youtube.com/watch?v=11fcg543Jow
I'm not sure if this mod is legal or not- but the grip laying on the floor at the end of the video made me very aware of the need to find a competent gunsmith.
Very good point lone. I try not to have anyone else work on my guns, and if I did, it would certainly not be a snap decision or just based on location or price.