The problem with Tru Tech is, you have to send your barrels to someone else that's "approved" by Tru Tech, to get your barrels to Tru to have them treated. Last I knew, an individual could deal direct with H&M. In my book, that is a BIG plus! You might contact 'Controlled Thermal Technologies' (CTT) in Phoenix as they are a metals treater who will nitride barrels, too. You don't have to go through someone else to send your barrels to them, either. They do not have a FFL, so they can not take actions. H&M does have a FFL, so they can (do actions). In the past, before they got particular with who their customer were, I used Tru Tech and got good results. But, I have got the same "good results" from H&M and CTT. Post Script; none of the companies mentioned have firearms components as their main source of business, Treating barrels is just a 'sideline'. H&M does do a lot of work for several firearms companies. But, nitride treating is used on many different items in many different applications.