The ProMag 40-Round 5.56/.223 Magazine for AR-15 (part no. RM-40-SL) is a 40-round .223 REM/5.56 NATO magazine built to fit the AR-15. ProMag builds it from black DuPont Zytel polymer for reliable feeding and a secure fit in the magazine well. It’s a solid pick for shooters who want a dependable spare for range, duty, and home-defense use. Whether you’re stocking up on spares or replacing a worn-out magazine, the ProMag 40-Round 5.56/.223 Magazine for AR-15 is built to run when you need it.

Key Specifications

• Chambered for .223 REM/5.56 NATO ammunition.
• Holds 40 rounds per magazine.
• Built to fit the AR-15.
• Finished in black DuPont Zytel polymer for a durable, distinctive build.
• Weighs about 0.73 lb, light enough to carry as a spare.
• Uses an anti-tilt follower so rounds feed straight even under uneven pressure.
• Spring is formed from chrome-silicon wire for long-term reliability.

Frequently Asked Questions

How many rounds does the ProMag 40-Round 5.56/.223 Magazine for AR-15 hold? It holds 40 rounds of .223 REM/5.56 NATO.

What does the ProMag 40-Round 5.56/.223 Magazine for AR-15 fit? It’s built to fit the AR-15. Always confirm fit against your exact make and model before ordering.

What is the ProMag 40-Round 5.56/.223 Magazine for AR-15 made from? It’s built from black DuPont Zytel polymer.

Buy the ProMag 40-Round 5.56/.223 Magazine for AR-15

Order the ProMag 40-Round 5.56/.223 Magazine for AR-15 from our Lubbock, Texas gun shop for fast shipping. Browse more AR-15 magazines at Schaefer Defense.