Eh... Washington State banned ALL semi-automatic center-fire rifles this year. Yeah, you read that correctly, all of them. So you can't even get a rifle, let alone a bump stock.

The Trump administration, in a rare break from gun rights groups, quickly banned bump stocks

Where do people keep getting this notion that trump is in favor of gun rights? He's on record saying that he prefers to take guns away extra-judicially, and his only legislation for firearms was to ban some. He's a tyrant, and like all tyrants, he does not want an armed populace.