Monoforge™ upper receiver with LWRCI™ modular rail system is stronger and lighter. LWRCI™ design features a full 12” user-configurable rail system for easy customization. LWRCI™ cold hammer-forged NiCorr-treated spiral fluted barrel is 20% lighter than unfluted barrel of same diameter. Increased surface area speeds cooling. LWRCI™ Enhanced Fire Control Group is Nickel-Boron coated for a smooth, crisp trigger pull with positive reset. Every investment casting is x-rayed to ensure highest quality standards are maintained.