The Law Tactical ARIC (AR Internal Carrier) is a drop in conversion for AR15-type direct impingement firearms that replaces the traditional Bolt Carrier Group, Recoil Spring and Buffer. Firearms equipped with ARIC and Law Tactical Folding Stock Adapters can be fired repeatedly in both the folded and unfolded position, expanding the mission profile of the AR15. Once installed, ARIC does not require any tools for removal, reinstallation, cleaning, maintenance or conversion. Each component can be field stripped, inspected or replaced without tools. Maintaining the simplicity and efficiency of the AR system. ARs can be converted between ARIC and standard BCGs and recoil components without tools, maintaining compatibility with standard AR15 components, enhancing the ARs capabilities while maintaining interoperability. "C" carrier is designed for Unsuppressed usage with .223 Remington and 5.56mm NATO and should not be fired Suppressed. "M" carrier is designed for Suppressed usage with 5.56mm NATO and .223 Remington or unsuppressed usage with 5.56mm NATO. The difference is in the venting of the carriers. The "M" has more venting and will run slower than the "C" if used in the same firearm with the same ammo. All other parts of the ARIC are identical. Specifications for Law Tactical AR-15 ARIC-C Internal Carrier for Unsupressed Firearms: Manufacturer: Law Tactical Color: Black Cartridge: 5.56mm, .223 Remington Gun Make: AR Platform Gun Model: AR-15 Condition: New Package Contents: Law Tactical AR-15 ARIC-C Internal Carrier for Unsupressed Firearms