when was the 30 round m16 magazine introduced
M16 rifle In 1964, the M16 entered U.S. military service and the following year was deployed for jungle warfare operations during the Vietnam War.[1] In 1969, the M16A1 replaced the M14 rifle to become the U.S. military's standard service rifle.[15][16] The M16A1 improvements include a bolt-assist, chrome plated bore and a new 30-round magazine.[1] In 1983, the U.S. Marine Corps adopted the M16A2 rifle and the U.S. Army adopted it in 1986. The M16A2 fires the improved 5.56×45mm NATO (M855/SS109) cartridge and has a new adjustable rear sight, case deflector, heavy barrel, improved handguard, pistol grip and buttstock, as well as a semi-auto and three-round burst only fire selector.[17][18] Adopted in 1998, the M16A4 is the fourth generation of the M16 series.[19] It is equipped with a removable carrying handle and Picatinny rail for mounting optics and other ancillary devices.[19]
.38 Long Colt In civilian use, the .38 LC was chambered in a number of Colt revolvers and saw some use among target shooters. Various U.S. police forces also adopted the cartridge. However, the cartridge became nearly extinct after Smith & Wesson's more powerful .38 Special cartridge became widely popular as a civilian and police service cartridge. By 1908, even Colt was chambering their new Police Positive and New Army revolvers in ".38 Colt Special", which was nothing more than the standard .38 Smith & Wesson Special with a different headstamp.[10]