With limited exceptions, California law prohibits any person from manufacturing, importing into the state, keeping for sale, offering or exposing for sale, giving, or lending any large capacity magazine. Cal. Penal Code 12020(a)(2), (b). A large capacity magazine is defined as any ammunition feeding device with the capacity to accept more than ten rounds, but does not include any .22 caliber tube ammunition feeding device, any feeding device that has been permanently altered so that it cannot accommodate more than ten rounds, or any tubular magazine that is contained in a lever-action firearm. Section 12020(c)(25). California does not ban the possession of large capacity magazines.
Upon a showing of good cause, the California Department of Justice may issue permits for the possession, transportation, or sale of large capacity ammunition magazines between a licensed California firearms dealer and an out-of-state customer. Section 12079(a). This requirement applies for only the out-of-state importation and exportation of large capacity ammunition magazines, including the transportation of such magazines as necessary to complete a transfer to or from an out of state source. See Cal. Code Regs. tit. 11, 978.40.
Large capacity magazines may be manufactured for any federal, state, or local government or law enforcement agency, or for use by agency employees in the discharge of their official duties, whether on or off duty. Section 12020(b)(30). Large capacity magazines may also be purchased or loaned for the sole use as a motion picture, television or video prop. Section 12020(b)(31), (32)(A). Such magazines may also be resold to law enforcement agencies, government agencies, or the military, pursuant to applicable federal regulations. Section 12020(b)(32)(C).
For additional large capacity ammunition magazine regulations, see Cal. Code Regs. tit. 11, 978.40-978.44.
Colorado City of Denver High Capacity Ammunition Magazines
City of Denver Ordinances Sec. 38-130. - Assault weapons.
a. All semiautomatic action, centerfire rifles with a detachable magazine with a capacity of twenty-one (21) or more rounds.
b. All semiautomatic shotguns with a folding stock or a magazine capacity of more than six (6) rounds or both.
Specific magazine prohibited. It shall be unlawful to carry, store or otherwise possess a magazine which will hold or may be modified to hold twenty-one (21) or more rounds.
There is a provision in the law if you are a non resident of Denver traveling through the area you can not be charged with breaking this ordinances.
DC High Capacity Ammunition Magazines - D.C. Official Code 7-2506.01
(b) No person in the District shall possess, sell, or transfer any large capacity ammunition feeding device regardless of whether the device is attached to a firearm. For the purposes of this subsection, the term “large capacity ammunition feeding device” means 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. The term “large capacity ammunition feeding device” shall not include an attached tubular device designed to accept, and capable of operating only with, .22 caliber rimfire ammunition.”.
Hawaii High Capacity Ammunition Magazines
The manufacture, possession, sale, barter, trade, gift, transfer, or acquisition of detachable ammunition magazines with a capacity in excess of ten rounds which are designed for or capable of use with a pistol is prohibited. Haw. Rev. Stat. 134-8(c).
( 29-49) bans the possession, sale, or acquisition of large capacity feeding devices (magazines with a capacity of more than 15 rounds).
( 8-20-030(i) and 8-24-025) bans the transfer, acquisition or possession of assault ammunition (any ammunition magazine having a capacity of more than 12 rounds).
( 3-13G-3) bans the transfer, acquisition, possession, manufacture or distribution of assault ammunition (any detachable ammunition magazine having a capacity of more than 16 rounds).
( 27-2-1 and 27-1-2) bans the possession and sale of large capacity feeding devices (magazines with a capacity of more than 10 rounds).
( 5.120.180 and 5.120.190) bans the possession, transfer, acquisition or manufacture of assault ammunition (a detachable magazine box with a capacity of more than 35 rounds centerfire.).
Maryland High Capacity Magazines
A person may not manufacture, sell, offer for sale, purchase, receive, or transfer a detachable magazine that has a capacity of more than 20 rounds of ammunition for a firearm. Md. Criminal Law Code 4-305(b). This section does not apply to a .22 caliber rifle with a tubular magazine. Section 4-305(a).
Massachusetts Large Capacity Feeding Devices
The sale, offering for sale, transfer or possession of large capacity feeding devices for assault weapons (as defined under Mass. Gen. Laws ch. 140, 121), is prohibited unless such device was lawfully possessed on September 13, 1994. Ch. 140, 131M.
Under Massachusetts law, a large capacity feeding device is defined as: a fixed or detachable magazine, box, drum, feed strip or similar device capable of accepting, or that can be readily converted to accept, more than ten rounds of ammunition or more than five shotgun shells; or a large capacity ammunition feeding device as defined in the federal Public Safety and Recreational Firearms Use Protection Act, 18 U.S.C. section 921(a)(31) as appearing in such section on September 13, 1994. Ch. 140, 121. This does not include an attached tubular device designed to accept, and capable of operating only with, .22 caliber ammunition.
Large capacity feeding devices designed for large capacity rifles and shotguns may be lawfully possessed by a holder of a Class A or B license to carry. Ch. 140, 131(a),(b) Large capacity feeding devices designed for handguns may be possessed only by persons holding a Class A license to carry. Ch. 140, 131(a).
The Massachusetts Secretary of Public Safety (“Secretary”) is required to compile and publish a roster of large capacity handguns, rifles, shotguns and feeding devices for those firearms, as those weapons and devices are defined in Ch. 140, 121. Ch. 140, 131 3/4. The Secretary may amend the roster upon his or her own initiative, upon the initiative of the Gun Control Advisory Board under Ch. 140, 131 1/2, or upon the petition of any person seeking to place a weapon on or remove a weapon from the roster. Ch. 140, 131 3/4.
New Jersey Large Capacity Feeding Devices
New Jersey prohibits the manufacture, transport, shipment, sale or disposal of large capacity ammunition magazines, unless the magazine is intended to be used for authorized military or law enforcement purposes. N.J. Rev. Stat 2C:39-9h. New Jersey law defines “large capacity ammunition magazine” as a box, drum, tube or other container which is capable of holding more than 15 rounds of ammunition to be fed continuously and directly into a semi-automatic firearm. Section 2C:39-1y
New York Large Capacity Ammunition Feeding Device
It is a class D felony to manufacture, transport, dispose of, or possess a large capacity ammunition feeding device, which N.Y. Penal Law 265.00(23) defines as a magazine, belt, drum, feed strip, or similar device manufactured after September 13, 1994, that has a capacity of, or that can be readily restored or converted to accept, more than ten rounds of ammunition. Section 265.02.