ProMag Glock 21 45 ACP 13rd Polymer Magazine Overview: The ProMag Glock-pattern 13-round magazine is an aftermarket .45 ACP magazine designed for Glock large-frame pistols and compatible carbines. It combines reinforced polymer construction with steel lining for reliable feeding and secure fitment in defensive, range, and recreational applications. Key Features: 13-round capacity: Standard-capacity magazine for compatible Glock .45 ACP platforms. Steel-lined polymer body: DuPont Zytel polymer reinforced with full-length steel lining for durability. Chrome silicon spring: High-tensile spring supports reliable long-term feeding performance. Non-tilt polymer follower: Helps maintain smooth cartridge alignment and cycling. Witness holes: Numbered round indicators allow quick ammunition checks. Precision fitment: Manufactured to tight tolerances for secure magazine seating. Lifetime warranty: Backed by ProMag replacement coverage. Specifications: Manufacturer: ProMag Category: Pistol Magazine Caliber: .45 ACP Capacity: 13 Rounds Material: Steel-lined DuPont Zytel Polymer Follower Type: Non-Tilt Polymer Spring Material: Chrome Silicon Wire Color: Black Compatible Firearms: Glock 21 Glock 21SF Glock 30 Glock 41 KRISS Vector (.45 ACP models) Applications: Range shooting: Reliable spare magazine for practice sessions Training drills: Supports extended shooting with fewer reloads Defensive setups: Compatible with duty-size Glock platforms Pistol-caliber carbines: Works with select Glock-mag-fed PCCs Additional Features: Reinforced internal structure: Steel liner improves rigidity and durability Smooth feeding system: Optimized follower and spring design Secure magazine fit: Precision-molded body reduces wobble Visual round tracking: Witness holes simplify capacity checks SKU: GLK-A14UPC: 708279014369