the 30 round m16 magazine was introduced in 1969.
when was the 30 round m16 magazine introduced?
1969
the "model 606" car-15 heavy assault rifles were heavy barrel (hbar), open-bolt, full-automatic-only firearms developed for sustained automatic fire. like the browning automatic rifle (bar), the car-15 hbars did not have a quick-change barrel. the car-15 heavy assault rifle m1 used 20-round m16 box magazines, which limited its ability to provide sustained rates of automatic fire. the 30-round m16 box magazine was not available until 1969. the "model 606a" had a forward assist. the "model 606b" had a forward assist and the four-position selector. the army purchased fewer than 200 heavy assault rifle m1s for use in the small arms weapons systems (saws) tests in 1965.
car-15
in 2012, the us-based group defense distributed disclosed plans to "[design] a working plastic gun that could be downloaded and reproduced by anybody with a 3d printer." defense distributed has also designed a 3d printable ar-15 type rifle lower receiver (capable of lasting more than 650 rounds) and a 30-round m16 magazine. the ar-15 has multiple receivers (both an upper and lower receiver), but the legally controlled part is the one that is serialized (the lower, in the ar-15's case). soon after defense distributed succeeded in designing the first working blueprint to produce a plastic gun with a 3d printer in may 2013, the united states department of state demanded that they remove the instructions from their website. after defense distributed released their plans, questions were raised regarding the effects that 3d printing and widespread consumer-level cnc machining may have on gun control effectiveness.
applications of 3d printing