CMMG AR15 Bolt Assembly

Overview

CMMG AR15 Bolt Assembly Features The CMMG AR15 Bolt Assembly is manufactured from 9310 steel a nickel-chromium-molybdenum alloy selected for its combination of exceptional toughness impact resistance and fatigue strength that allows the bolt to withstand the repeated high-pressure cycling lug shear forces and cartridge extraction demands of sustained AR-15 use without cracking deforming or developing the lug wear that lower-grade bolt steel alternatives can exhibit over extended service life. The phosphate finish on the bolt body provides a corrosion-resistant oil-retaining surface that holds lubrication effectively across a wide range of operating temperatures and environmental conditions contributing to smooth cycling and reliable function in both clean and fouled conditions. For competitive shooters and duty professionals who run high round counts through their AR-15 platforms and need a bolt assembly that maintains consistent headspace and reliable extraction across thousands of rounds without requiring premature replacement the CMMG AR15 Bolt Assembly delivers the material quality and manufacturing precision the application demands. The 4140 steel extractor with phosphate finish provides a corrosion-resistant durable extraction surface that maintains consistent spring tension and claw geometry across extended use ensuring reliable case extraction and ejection across a wide range of ammunition types and pressure levels without the extractor deformation or spring fatigue that lower-grade extractor materials can develop over time. The pre-installed ejector extractor and gas rings allow the bolt assembly to be installed directly into any mil-spec AR-15 bolt carrier group without requiring the shooter to source and install individual components simplifying the replacement process and ensuring the assembly arrives configured to the correct specifications straight from the factory. For gunsmiths armorer-level AR-15 builders and serious shooters performing preventive maintenance or replacing a worn bolt assembly who want a complete pre-assembled unit that meets mil-spec dimensions and material standards the CMMG AR15 Bolt Assembly provides the most efficient and reliable replacement solution available at its price point. CMMG has built its reputation on precision manufacturing and rigorous quality control across its entire AR-15 component and complete rifle lineup and the AR15 Bolt Assembly reflects those standards in every detail from material selection to pre-installation of all consumable components before the assembly leaves the factory. The phosphate finish on both the bolt body and extractor provides a consistent corrosion-resistant surface that is compatible with standard AR-15 lubricants and cleaning solvents without degrading the finish or affecting the dimensional tolerances of the assembly over time. For AR-15 owners gunsmiths and serious builders who want a USA-quality replacement bolt assembly built to the material and manufacturing standards that long-term reliability demands the CMMG AR15 Bolt Assembly is available for sale at GrabAGun and ships ready to install. CMMG AR15 Bolt Assembly Specifications Manufacturer: CMMG Model: AR15 Bolt Assembly Type: Bolt Assembly Bolt Material: 9310 Steel Bolt Finish: Phosphate Extractor Material: 4140 Steel Extractor Finish: Phosphate Pre-Installed Components: Ejector Extractor Gas Rings Compatible Platform: AR-15 Available At: GrabAGun