SPOKANE, Wash. — Spokane County gun owners sold 74 bump stocks to Washington State Patrol during a buyback event on Sunday and Monday, according to spokesperson Chris Loftis. 

The devices will soon be illegal at the state and federal level. Washington Gov. Jay Inslee approved a $150 back buy program.  

The federal government banned the devices in 2018 and the state created the buyback program at the same time. The state legislature then gave $150,000 to the buyback program, which would cover 1,000 units at $150 per device, according to Loftis. 

Bump stocks become illegal nationwide on March 26.

RELATED: Washington state buying rifle bump stocks from residents for $150

RELATED: Trump administration moves to ban bump stocks

Loftis said Washington state residents sold 291 bump stocks on Sunday and another 229 during Monday's event for a total of 520. Seventy-four of those bump stocks came from District 4, which includes Spokane, Colfax, Ritzville and Colville. 

More buyback events will be held March 24-25 at all WSP offices.

Each person who brings in a bump stock receives a voucher for $150. WSP then mails individuals a check for $150 for each bump stock they turn in once the voucher is processed. Checks will not be issued the day a person turns in their bump stock.

Officials said there is a limit of five bump stocks per individual and all vouchers will be issued on a first-come, first-serve basis. Once the $150,000 appropriated to the buybacks has been distributed, no more funds will be available.

Here’s a list of locations and dates:

March 17-18, 2019

District 1 – Tacoma – 2502 112th Street East

District 2 – Bellevue – 2803 156th Avenue SE

District 3 – Kennewick – 143302 E Law Lane

District 4 – Spokane – 6403 W Rowand Rd

District 5 – Vancouver – 11018 NE 51st Circle

District 6 – Wenatchee – 2822 Euclid Avenue

District 7 – Marysville – 2700 116th Street NE

District 8 – Hoquiam - 3111 Pacific Avenue

March 24-25, 2019

District 1 – Tacoma – 2502 112th Street East

District 2 – South Seattle – 15666 International Blvd (detachment office)

District 3 – Yakima – 2715 Rudkin Road

District 4 – Spokane – 6403 W Rowand Rd

District 5 – Vancouver – 11018 NE 51st Circle

District 6 – Ellensburg - 291 S Thorp Hwy

District 7 – Marysville – 2700 116th Street NE

District 8 – Bremerton – 4811 Werner Road

For more information, click here.