Primary Weapons Systems MK2 Lower Receiver Complete Lower Features The Primary Weapons Systems MK2 Lower Receiver is built as a complete semi-automatic lower meaning it arrives ready to accept a compatible upper receiver rather than requiring the builder to source and install individual internal components. Its multi-caliber compatibility gives builders flexibility to configure their rifle around the cartridge of their choice rather than being locked into a single chambering. The anodized black finish provides a durable corrosion-resistant surface that holds up to repeated handling and field use. Primary Weapons Systems built its reputation on precision-made AR components and the MK2 lower reflects that standard of manufacturing. Because it ships as a complete lower rather than a stripped receiver the MK2 saves builders the time and expense of sourcing and installing a trigger group pistol grip and other lower parts kit components separately. The matte black anodized finish blends easily with a wide range of upper receiver finishes and furniture choices giving builders flexibility in how they complete their rifle. This lower serves as the serialized foundation of the firearm making it the first and most important decision in any custom build. The Primary Weapons Systems MK2 Lower Receiver is available for sale at GrabAGun for builders looking for a dependable ready-to-use foundation for their next project. Primary Weapons Systems MK2 Lower Receiver Complete Lower Specifications Manufacturer: Primary Weapons Systems Model: MK2 Lower Receiver Action: Semi-automatic Type: Complete Lower Receiver Color: Black Finish: Anodized Caliber: Multi-Cal Available At: GrabAGun