Troy Industries AR-15 A3 Upper Receivers are lightweight and ultra-low profile. Developed specifically for today’s war fighter and Law Enforcement led by Special Operations field requirements. The M-Lok Battlerail handguard is machined from hardened aircraft aluminum with stainless steel components and finished in MIL-SPEC hardcoat anodizing” the M-LOK rails are light and sleek. The M-LOK slots make for mounting your favorite M-LOK accessories quick and easy.