ProMag AR-15 5.56mm / .223 Rem 42rd Polymer Extended Magazine Overview The ProMag AR-15 42-Round Extended Magazine is designed to provide increased ammunition capacity and dependable performance for AR-platform rifles. Constructed from durable DuPont Zytel-based polymer and equipped with premium internal components, this magazine delivers reliable feeding and long service life for range training, recreational shooting, and tactical applications. Key Features 42-round extended capacity Compatible with AR-15 and M16 rifles chambered in .223 Remington and 5.56 NATO Proprietary DuPont Zytel polymer magazine body for lightweight durability Injection-molded polymer follower for smooth cartridge presentation Heat-treated chrome silicon wire spring for enhanced reliability Extended design reduces reload frequency during shooting sessions Made in the USA Black finish Specifications Caliber Compatibility: .223 Remington, 5.56x45mm NATO, .300 AAC Blackout Capacity: 42 Rounds Material: DuPont Zytel Polymer Follower Type: Injection-Molded Polymer Spring Material: Heat-Treated Chrome Silicon Wire Color: Black Firearm Type: Rifle Fits: AR-15, M16, FN SCAR 16/16S, FN FS2000, FN F2000, FN 15, Sig Sauer SIG516, Sig Sauer M400, Sig Sauer MCX, Sig Sauer SIG556, HK416, HK MR556A1, Remington R-15, Bushmaster ACR, FightLite SCR, FightLite MCR, SA80, Beretta ARX160 MPN: COL-A16BUPC: 708279012679 Applications Ideal for target shooting, range training, recreational shooting, competition use, and tactical training where increased magazine capacity can help minimize reload interruptions. Additional Features The lightweight polymer construction helps reduce overall firearm weight while maintaining strength and durability. Its extended capacity design offers shooters more trigger time between magazine changes, making it an excellent addition to any AR-platform rifle setup.