American Built Arms Company Pro 5.56mm Cam Pin Silver Small. The Nickel Boron coated Cam Pin needs virtually no lube during use. These Cam Pins are ready to drop into your bolt carrier group. These Cam Pins are specially made on high end Swiss machinery to have exacting tolerances and surface finish. AB Arms is known by rifle manufacturers for manufacturing one of the finest quality bolts and extractors available. This has won us contracts with some of the highest quality AR manufacturers in the business. If you want to buy super high quality parts offered by the company that actually manufactures them then you've come to the right place. Cam Pin: E4340 Steel Heat treated per Mil-Spec Requirements Nickel Boron Coated Specifications for American Built Arms Company Pro 5.56mm Cam Pin: Manufacturer: American Built Arms Company Gun Model: AR-15 Package Contents: American Built Arms Company Pro 5.56mm Cam Pin What firearm models does the manufacturer say American Built Arms Company Pro 5.56mm Cam Pin is compatible with? The manufacturer says that American Built Arms Company Pro 5.56mm Cam Pin is compatible with AR-15American Built Arms Company ABACPNB: Pro 5.56mm Cam Pin Silver Small