No Logo Branding M16-cut carrier Machined from 8620 Tool Steel (Carrier) and 9310 Steel (Bolt) Billet Gas Key & Extractor (No MIM Parts) Carrier has Forward Assist Serrations HIGH POLISH DLC finish Chrome – Advanced Lower Friction Coating that Minimizes Cleaning and Maintenance. Properly Staked Gas Key HPT Tested MPI Tested Machined & Heat Treated to USGI Specifications. Internally QC checked and Tested to Ensure Reliability.