Sharps Rifle Company Xtreme Performance Relia-Bolt DLC Coated Black. Specifications for Sharps Rifle Company Xtreme Performance Relia-Bolt: Manufacturer: Sharps Rifle Company Color: Black Finish: DLC Fabric/Material: S7 Tool Steel Caliber: .223 Remington Gun Make: AR Platform Gun Model: AR-15 Features of Sharps Rifle Company Xtreme Performance Relia-Bolt Patented bolt technology. The redesigned lugs of the Relia-Bolt virtually eliminate the most common MSR malfunction; the bolt to barrel extension jam. Havent cleaned your rifle? Is it out of time? The Relia-Bolt compensates by providing a patented camming action which guides the bolt past obstructions and into battery (U.S. Patent No. 9863729). The rounded/tapered lugs push past carbon and debris when the square edges of traditional bolts would typically jam. Once into battery the rear edges of the lugs fully engage the barrel extension for absolute strength and security. 100percent Compatibility. XPB is drop-in compatible with all existing .223/5.56 variant parts groups and bolt carriers; no modifications or tools are necessary for installation. Unmatched Strength and Durability. The Relia-Bolt is machined from S7 tool steel and tempered with SRCs proprietary heat-treating process significantly increasing strength when compared to MilSpec Carpenter 158. S7 provides a 75percent increase in tensile strength and nearly 60percent improvement in yield strength. Package Contents: Sharps Rifle Company Xtreme Performance Relia-Bolt What firearm models does the manufacturer say Sharps Rifle Company Xtreme Performance Relia-Bolt is compatible with? The manufacturer says that Sharps Rifle Company Xtreme Performance Relia-Bolt is compatible with AR-15Sharps Rifle Company XPB: Xtreme Performance Relia-Bolt DLC Coated Black