WMD Guns Firing Pin Features The WMD Guns Firing Pin is built from steel and treated with the company s proprietary NiB-X coating a nickel boron based finish engineered to deliver exceptional surface hardness rated at Rc-70. That hardness translates directly into wear resistance helping the firing pin maintain consistent ignition performance over a long service life in a 5.56 NATO AR-15. The NiB-X coating also provides superior lubricity compared to an untreated steel pin which reduces friction during the firing cycle and helps the bolt carrier group cycle more smoothly. Corrosion resistance rounds out the coating s benefits protecting the pin from the buildup of carbon fouling and moisture that can lead to sluggish or inconsistent strikes over time. Designed as a spare part for WMD Guns bolt carrier groups this firing pin fits standard AR-15 platforms and serves as a drop-in replacement for a worn or damaged factory pin. Keeping a spare on hand is a simple way for AR-15 owners to avoid downtime from a broken firing pin especially for rifles that see heavy range use or duty carry. WMD Guns builds its bolt carrier group components with high-performance coatings and best-in-class materials and this firing pin reflects that same manufacturing philosophy. Whether upgrading an existing bolt carrier group or stocking a spare parts kit the WMD Guns NiB-X Firing Pin is available for sale at GrabAGun. WMD Guns Firing Pin Specifications Manufacturer: WMD Guns Model: Firing Pin Type: Firing Pin Compatible Hosts: AR-15 Color: Nickel Finish: NiB-X Material: Steel Available At: GrabAGun