What gun will m-16 magazines fit?

Answer 1

Many. Some examples include:

• M16/AR-15 and variants (includes Diemaco/Colt Canada C7 and C8, Norinco CQ-5.56 and CQ-5.56A, DIO S-2000 and Khaybar 2002).
• Fabrique National FNC and variants (includes Pindad SS-1 and SS-2 and Bofors AK5)
• Daewoo K1 and K2
• Howa Type 89
• Steyr AUG A3 (with STANAG magazine option)
• NORINCO QBZ-03 (5.56mm export version)
• NORINCO QBZ-95 (5.56mm export version)
• Fabrique Nationale SCAR-L
• Enfield L85, L22, and L86
• Heckler & Koch HK416
• CIS/STK SR-88 and SR-88A
• Israeli Weapons Industries Tavor TAR-21
• Israeli Weapons Industries Galil and Galil AR (5.56x45 versions with a STANAG magazine adapter)
• Fabrique Nationale FN2000
• IMBEL MD-2 and MD-97
• Remington/Bushmaster ACR
• 205th Armory Type 65, Type 89, and Type 91

As for purely commercial firearms intended for the civilian market, they include:

• AR-15 style rifles from various manufacturers
• Kel Tec SU-16
• Armalite AR-180B (M16 magazines will not fit the original AR-18 or AR-180)
• SIG-556

There are countless other firearms which use this magazine, but these are some of the more common ones.