Model Variants (Including Prototypes)
AR-15 - Armalite Designation
Model 601 - Colt Model; adapted by the USAF; 1:14-inch rifling twist; triangular charging handle.
Model 602 - Colt Model Designation; 1:12-inch twist; triangular charging handle.
Model 604 - Colt Model Designation; improved model.
Model 655 M16A1 SHP (Special High Profile) - Colt Model Designation for sniper variant; heavy barrel and Leatherwood/Realist 3.9x Adjustable Ranging Telescope scope mount.
Model 656 - Colt Model Designation for sniper variant; heavy barrel and Leatherwood/Realist 3.9x Adjustable Ranging Telescope scope mount; sans carrying handle.
Model 720 - Cold Model Designation of the XM4/M4 Carbine variant.
Model 733 - Developmental M16 carbine version with shortened barrel and telescoping stock; modernized version of the XM177E2 with improvements found on the M16A2.
XM-16 - Alternative designation for Colt Model 602.
M16 - Base Production Model Designation; first operation version; adapted by the USAF.
XM16E1 - US Army Designation of the M16
M16A1 - US Army Finalized Production Model
M16A1 Mk 4 Mod 0 - Specialized Variant produced for the Navy SEALs; optimized for "wet" environments; sound suppressor.
M16A2 - Revised rifling; thicker barrel; M203 grenade launcher capable; square post front sight; adjustable rear sight added; revised flash suppressor; modified front grip; lengthened buttstock; polymer stock; 3-round burst setting.
M16A3 - Fully-Automatic derivative of the M16A2; M16A1 trigger group; semi-automatic and full automatic fire modes.
M16A4 / M16A4 MWS- Picatinny Rail for scope and sighting systems; 3-round burst firing mode of the M16A2 accessory attachments through Knight's Armament Company system; sometimes called M16A4 MWS (Modular Weapon System).
XM177E1 - Developmental M16 carbine version; shortened barrel to 10 inches; telescoping stock.
XM177E2 - Developmental M16 carbine version; shortened barrel to 11 inches; telescoping stock.
M231 FPW (Port Firing Weapon) - Rock Island Arsenal development based on M16 for firing from the inside of the M2/M3 Bradley vehicles; fully-automatic fire form open bolt; sans buttstock; short barrel.
XM4 Carbine - Trials version of compact M16 rifle.
M4 Carbine - Production designation of compact M16 rifle; 3-round burst fire mode; Picatinny rail system; removable carrying handle.
M4A1 Carbine - Full Automatic Fire Mode; Picatinny rail system; removable carrying handle.
C7 - Canadian Designation; production by Diemaco; developed version of the M16A1E1; single or automatic fire modes; lengthened stock; revised rear sight.
C7A1 - Canadian Designation; Weaver rail system; improvements throughout
C8 - Canadian Designation; updated M16 variant.
NORINCO CQ-311 - Unlicensed Chinese copy of the M16A1; revolver-style pistol grip; export product.
Khaybar KH2002 - Iranian conversion model based on the S-5 rifle, itself an M16 copy based on the NORINCO model; bullpup configuration.
MSSR - Philippine development sniper rifle based on the M16.
Type 65 (T65) - Taiwanese Assault Rifle based on the M16; short-stroke gas system; revised iron sights; reshaped stock
Type 86 (T86) - Taiwanese Assault Rifle based on the M16; gas-operated, rotating bolt; M16A2-style sights.
Type 91 (T91) - Taiwanese Assault Rifles based on the M16; gas-operated, rotating bolt; features found on the M16 and AR-18 series rifles.
M/95 - Danish Designation of Canadian C7 rifle.
M/96 - Danish Designation of Canadian C8 rifle.