There are already files you can download and 3D print one. Think the horse may have already left the barn...
You can just file down the sear pin in your AR and when you take the safety off it will fire til the mag is empty. Banning bumpstocks is just another feel good knee jerk reaction.
I’m sending my two senators and my rep a thoughtful email warning them not to even think of backing any further infringement of the 2nd amendment.