Brownells, as they sponsor most of the ones previously listed. (and a huge plus is that you get to see my Dapper self on there often lol)
https://www.youtube.com/user/brownellsinc/videos
Agreed, have done several. I used to do warranty work for Browning and you gotta be careful with those receivers. I would recommend checking around and making sure you choose a gunsmith that has done it before. I know Jim's has, as the shop manager there worked with me at said Browning warranty...
Save the headache of tuning buffers and springs. Get an adjustable gas block and tune that for a standard buffer and spring. Different grendel barrels are drilled differently. There are no gas port standards for those barrels so dwell times will be different. For example, I have two 18" Grendel...
Just trying to give options, I know Jim's will do an excellent as I personally spent many years helping the development and growth of the gunsmith department there as well as Reynerson's Gunsmith Service. As for the "loan" comment, the price is fair...
You know I gotta stop in and see how its going! Its almost 0 Degrees here so I tried coming to Bayoushooter to warm up a bit.
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I have been called much, much worse...