You need to pick a reputable AR smith for this work. I have fixed way too many "hack" pin and weld jobs by other "smiths".
There are a few good shops locally like Scotts but you will wait a while due to his backlog.
As mentioned, ADCO will pretty much match any local pricing you will find for a REPUTABLE AR Smith when you consider shipping into the price, and ADCO will turn it around in under 2 weeks.