New Provisions Start July 1 Under State’s New Gun Law

Changes to gun laws in Washington State become law on July 1.
In 2018 voters approved initiative 1639 that among other changes makes it illegal for anyone under 21-years-old to buy a semiautomatic rifle. New provisions that take effect on Monday, July 1 include enhanced background checks and waiting period requirements for the purchase and transfer of rifles.
The law also requires specific training before a rifle can be purchased. The Range in Yakima is now offering a I-1639 rifle certification classes to help people obtain a special certificate that is required for purchase. Along with that requirement there's also a 10 day waiting period and new storage requirements.
Under the measure, stores that sell guns are required to give or sell the gun buyer a gun storage device like a trigger lock.

Retailers that sell firearms is required to display a warning sign in block letters that reads;

WARNING: YOU MAY FACE CRIMINAL PROSECUTION IF YOU STORE OR LEAVE AN UNSECURED FIREARM WHERE A PERSON WHO IS PROHIBITED FROM POSSESSING FIREARMS CAN AND DOES OBTAIN POSSESSION.
The new provisions take effect on Monday, July 1.