I recently went through the process of purchasing a suppressor (still waiting on ATF of course). There have been similar threads regarding hearing loss and thought I would share with everyone where this Introduced bill stands. Below is a link to the current sponsors. ND has Kevin Cramer, but missing John Hoeven and Heidi Heitkamp. SD doesn't have any sponsors. ASA has a section where you can submit a canned support message to the officials, or you can edit it how you please. You can deselect Cramer as he is already supporting the bill.
https://www.congress.gov/bill/115th-congress/house-bill/367/cosponsors
http://americansuppressorassociation.com/hearing-protection-act/
https://www.congress.gov/bill/115th-congress/house-bill/367/cosponsors
http://americansuppressorassociation.com/hearing-protection-act/