ProMag COLA35 40rd AR-15 Magazine .223/5.56 Steel/Polymer

The ProMag COLA35 is a 40-round high-capacity magazine designed for AR-15/M16 pattern rifles chambered in .223 Rem / 5.56 NATO. It combines a heat-treated, black-oxide-finished steel feed tower with a DuPont Zytel polymer body to balance durability and weight. A high-tensile chrome silicon wire spring and an injection-molded polymer follower promote reliable feeding and smooth operation. The magazine is made in the USA and is offered with a lifetime warranty.

Key Specifications

• Caliber: .223 Rem / 5.56 NATO.
• Capacity: 40 rounds.
• Construction: heat-treated black-oxide steel feed tower and DuPont Zytel polymer body.
• Spring: high-tensile chrome silicon wire spring.
• Follower: injection-molded polymer follower.
• Compatibility: most commercial-spec and mil-spec AR-15 receivers.
• Fit: precision-machined magazine catch cutout for a snug, wobble-free fit.
• Warranty: lifetime warranty.
• Origin: Made in the USA.
• Weight: 0.595.

Built for range use, training, and competitive shooting where capacity and consistent feeding matter, the COLA35 pairs robust materials with proven internals for dependable performance. Its hybrid steel/polymer construction and reliable spring-and-follower system offer long service life and straightforward maintenance, making it a practical addition for shooters who prioritize durability and repeatable function.