A firearm magazine can hold several rounds of ammunition and is detachable from the firearm. Washington law does not impose regulations relating to ammunition or ammunition magazines, aside from a requirement that firearms dealers must obtain a license to sell ammunition. In 1994, Congress enacted a ban on the manufacture, transfer, and possession of assault weapons and large capacity ammunition feeding devices capable of holding more than ten rounds of ammunition, but exempted assault weapons and large capacity ammunition feeding devices that were manufactured before the law became effective. This law was subject to a sunset provision and expired in 2004.
Nine states and the District of Columbia have enacted laws that prohibit or place restrictions on large capacity magazines, typically defined as magazines capable of accepting more than ten or 15 rounds of ammunition. Some of these state laws completely ban the manufacture, transfer, or possession of large capacity magazines, while others exempt large capacity magazines that were possessed prior to the law's effective date.
Gross Misdemeanors. Every person convicted of a gross misdemeanor defined in law shall be punished by imprisonment in the county jail for a maximum term, fixed by the court, up to 364 days, or by a fine, in an amount fixed by the court, of not more than $5,000, or by both.
A large capacity magazine is defined as an ammunition feeding device with the capacity to accept more than ten rounds of ammunition, or any conversion kit, part, or combination of parts, from which such a device can be assembled if in the possession of the same person. A large capacity magazine does not include:
A person may not manufacture, possess, distribute, import, transfer, sell, offer for sale, purchase, or otherwise transfer a large capacity magazine except as specifically authorized.
The ban does not apply to the following:
A person who legally possessed the large capacity magazine prior to the effective date of this law, or other person who legally inherits a large capacity magazine must comply with the following:
A violation is a gross misdemeanor offense.