I sent off my Axis bolt to have them install a new bolt knob and coat bolt body with Cerakote microslick. I could not be happier with the results. I've had my TRG 42 bolt coated with microslick and it improves the bolt.

I wanted to give Phoenix Customs a big shout out for great pricing, but for fast turn around. I shipped my bolt on 02/11/13 and it arrived 02/20/13 even with Monday being a holiday. They had an offer over on SH to for bolt, bolt install along with Cerakote for $70 which also included shipping back. I paid $100, since I had the bolt body coated in microslick. Well worth the money.

http://phoenixcustomrifles.com/Products.html