ProMag AR-15 Hybrid Steel/Polymer Magazine - 5.56 - 40 Round

This ProMag 40-round magazine fits AR-15/M16 rifles and carbines chambered in .223/5.56x45mm. The hybrid construction pairs a blued steel upper housing with a durable polymer lower, backed by a chrome silicon spring for the reliable feeding AR-15 shooters expect, made in the USA.

Features:

• 40-round capacity
• Fits AR-15/M16 rifles and carbines chambered in .223/5.56x45mm
• Steel upper housing, blued finish
• Polymer lower housing
• Injection molded follower
• Heat-treated chrome silicon wire spring
• Made in the USA

The steel upper housing reinforces the feed lips and locking lugs at the magazine's highest-wear contact points, while the polymer lower housing keeps overall weight down compared to an all-steel body. The heat-treated chrome silicon spring resists fatigue and set over repeated loading cycles, helping maintain reliable feeding pressure over a long service life.

ProMag manufactures magazines for a wide range of rifle, shotgun, and pistol platforms, focused on affordable, reliable capacity upgrades for shooters.