Product Description
Product Description
Built for compact power and reliability, the 3KEYZ Tactical Atriox 7.5″ Pistol Upper Build Kit delivers a high-performance AR-15 upper ready for your build. It features a 7.5″ 4150 C-M-V barrel with a 1:7 twist and a manganese-phosphate finish, tuned for 5.56 NATO. The piston-style gas system ensures consistent cycling and smooth operation, while the 7″ free-float M-LOK handguard provides modularity and a lightweight profile. A durable 7075-T6 aluminum upper receiver completes the setup — this kit is a solid foundation for a compact, reliable, and efficient AR pistol build.
