Just got my M12 Impact back from H&M after having the barreled action, bolt, lug, and action screws black nitrided. The metal finish looks outstanding; has changed the flat Teflon to a much darker, deeper black. The action is so slick now it almost doesn't seem real. If the weather durability is even half of what was advertised from true nitriding (actually changing surface composition not just coating) this was worth far more than it cost to have done. I had actually planned to sell the rifle when it got back as part of an ammo consolidation... but I can't bring myself to do it now.
If you're thinking about using H&M I can't recommend them highly enough for both finished product and customer service along the way.
