ProMag builds rugged and reliable aftermarket furniture and magazine products for a wide variety of firearms.This extended capacity 42-round AR-15 mag is a lightweight mag that can be paired with the rest of your AR-15 magazines or help build a new collection.The additional capacity can help you run rifle courses faster reducing the amount of reloads necessary.42-round AR-15 magazine .223/5.56DuPont Zytel based polymerInjection-molded magazine followerMagazine spring formed from heat-treated stainless steel Made in USAStock up on additional magazines whenever you can as more mags are always helpful. For training tactical or recreational use having multiple magazines is tremendously helpful.Having dozens of pre-loaded magazines is even better as this arrangement allows you to spend all your time shooting and dumping magazines instead of tediously filling them up one round at a time at the range.Looking for more AR15 mags? Get big savings when on our entire online inventory of low-priced AR-15 Magazines for sale.