K40M; AR-15 Magazine, 20 Round, .40 S&W

AR-15 Magazine, 20 round, .40 S&W Magazine for AR-15 lower receivers.

ALERT! THESE MAGAZINES ONLY COMPATIBLE WITH OLYMPIC ARMS BRAND 40 S&W CONVERSIONS!
TO BE MORE CLEAR - THESE OLYMPIC ARMS PISTOL CALIBER MAGAZINES DO NOT WORK WITH COLT, CMMG, ROCK RIVER, OR OTHER AFTERMARKET PISTOL CALIBER CONVERSIONS.

This is the new generation pistol caliber magazine for Olympic Arms carbines and conversion uppers chambered in 40 S&W ands are designed to work only in Olympic Arms brand upper conversions. 

Are these mags tough? You bet. Made in the USA (Washington State) using the latest technology of fiberglass embedded polymer, you can run these mags over with your car, and they keep on functioning!

NOTES:

1. The feed ramp in the Pistol Caliber Upper Receivers has changed slightly over the years and the magazine may not work in all Olympic Arms brand Upper Receivers without minor modification. If you purchase a magazine and it doesn’t feed properly send in your upper receiver to the factory to perform this modification free of charge."
2. THESE MAGAZINES DO NOT WORK WITH AFTERMARKET 40 S&W CONVERSIONS. 
3. Only compatible with Olympic Arms upper conversions.