Semi-automatic AR-15s for sale to civilians are internally quite different from fully automatic versions for sale to law enforcement and military customers, though nearly identical in appearance. The hammer and trigger mechanisms are of a different design. The bolt carrier and internal lower receiver of semi-automatic versions are milled differently, so that the firing mechanisms are not interchangeable. This was done specifically to satisfy BATF requirements that civilian weapons may not be easily convertible to fully-automatic. Despite this, through use of a “Drop In Auto Sear” or “lightning-link,” conversion to full automatic is very straightforward (sometimes requiring slight modification to the bolt carrier).[13][14] Such modifications, unless using registered and transferrable parts made prior to May 19, 1986, are illegal. (The Firearm Owners Protection Act in 1986 has redefined a machinegun to include individual components where a semiautomatic firearm can be converted to full-automatic based on a 1981 BATF ruling on machinegun parts.) An illegally converted fully-automatic AR-15 was used in the North Hollywood shootout.
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Chicago Gun Ban Could Be Overturned
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Chicago mayor defends handgun ban after shootings
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