https://www.cga.ct.gov/2013/rpt/2013-R-0039.htm
Federal Law
The 1994 federal Violent Crime Control and Law Enforcement Act, which amended the 1968 Gun Control Act, made it illegal to transfer or possess “large capacity ammunition feeding devices” not lawfully possessed on or before the law's enactment. But the law permitted the sale of magazines manufactured before the ban (formerly codified at 18 USC § 922(w)(1) and (2)). (The act also banned the manufacture, transfer, and possession of semi-automatic assault weapons.)
The act defined “large capacity ammunition feeding device” as “a magazine, belt, drum, feed strip, or similar device . . . that has a capacity of, or that can be readily restored or converted to accept, more than 10 rounds of ammunition.” It exempted attached tubular devices designed to accept and capable of operating only with .22 caliber rim fire (18 USC § 921(a)(31(A) &(B)). The act included a sunset clause, under which the ban expired after 10 years, on September 13, 2004. Congress allowed the law to expire, and consequently, formerly banned high capacity ammunition magazines (and assault weapons) are now legal unless banned by state or local governments.
***Nevada has no such law on the books.