Many historians consider the first modern assault rifle the WW 2 German Sturmgewehr 44 placed in service in late 1943. It used a lighter cartridge that infantry rifles of that time used and used a gas-operated action, with both semi-automatic and fully automatic firing modes. The USSR recognized the need for a similar weapon and produced the AK-47 in 1949 which was developed by Mikhail Kalashnikov. The US M-16 history is very complicated, with many problems on its initial entry in Vietnam. It took till 1968 for the M16 to achieved widespread acceptance by U.S. troops in Vietnam. The various M-16 models have semi-automatic, burst and fully automatic modes. The M16 cartridge is lighter than the previous M-1 & M-14 cartridge, but has a higher muzzle velocity. It fires the 0.223 caliber ( 5.56×45mm) cartridge and can produce massive wounding effects when the bullet impacts at high velocity and yaws in tissue leading to fragmentation and rapid transfer of energy.
Except with very restricted ATF conditions, it is not legal to have a automatic version of any of these or similar weapons in the US. It is legal to have a semi-automatic version of these weapons along with many other weapons which have a semi-automatic mode. Semi-automatic weapons require the pull of the trigger each time for the weapon to fire. Semi-automatic weapons run basically from 22 cal (0.22 in diameter) thru 50 cal (0.50 in diameter). How fast the trigger can be pulled and the weapon fires widely varies.
The Bushmaster AR-15, used at Newtown, is similar to the semi-automatic M-16 and is one of the M-16 clones available. The Bushmaster AR-15 has an effective firing rate of 45 shots per minute, according to an online Bushmaster manual. Generally the M-16 clones weapons use a high-capacity 30-round magazine. Larger magazines are easily available, for example the SUREFIRE 60 and 100 round capacity magazines. Let's do a small calculation here using the 100 round magazine and the AR-15 fire time, let's see it takes then 2.2 minutes to fire 100 rounds! As a reminder, these bullets produce massive wounding effects when the bullet impacts at high velocity and yaws in tissue leading to fragmentation and rapid transfer of energy. I have yet to hear a good deer hunter or even a varmint hunter reason why they need any more than a 3 round magazine!
Except with very restricted ATF conditions, it is not legal to have a automatic version of any of these or similar weapons in the US. It is legal to have a semi-automatic version of these weapons along with many other weapons which have a semi-automatic mode. Semi-automatic weapons require the pull of the trigger each time for the weapon to fire. Semi-automatic weapons run basically from 22 cal (0.22 in diameter) thru 50 cal (0.50 in diameter). How fast the trigger can be pulled and the weapon fires widely varies.
The Bushmaster AR-15, used at Newtown, is similar to the semi-automatic M-16 and is one of the M-16 clones available. The Bushmaster AR-15 has an effective firing rate of 45 shots per minute, according to an online Bushmaster manual. Generally the M-16 clones weapons use a high-capacity 30-round magazine. Larger magazines are easily available, for example the SUREFIRE 60 and 100 round capacity magazines. Let's do a small calculation here using the 100 round magazine and the AR-15 fire time, let's see it takes then 2.2 minutes to fire 100 rounds! As a reminder, these bullets produce massive wounding effects when the bullet impacts at high velocity and yaws in tissue leading to fragmentation and rapid transfer of energy. I have yet to hear a good deer hunter or even a varmint hunter reason why they need any more than a 3 round magazine!