What is the generally excepted price on this? I've only talked to one smith so far and he quoted me 85 bucks to put on a 70 dollar free float. Seemed a bit excessive to me, especially considering I've done alot of the other work like taking the old gas block and handguard cap off and putting my gas tube on my new gas block. Literally all that needs to be done is taking the old barrel nut off and properly torqueing/alinging the new barrel nut. Am I asking too cheap of a gunsmith or are there others around who can perform this work for a much more reasonable cost (or perhaps let me work on their equipment for a small fee)?