I already did. For OBs's sake, and others -
https://www.opensecrets.org/lobby/top.php?indexType=s&showYear=2017
According to the above link, the NRA spent a little over $5 million dollars. Chump change in comparison to others on the list. Here are the top 20 registered lobby groups, rated by the amount spent lobbying.
All of these groups - including the NRA - are operating legally. So OB, are you proposing that the NRA should be denied their right to lobby?
Lobbying Client Total
US Chamber of Commerce $82,190,000
National Assn of Realtors $54,530,861
Business Roundtable $27,380,000
Pharmaceutical Research & Manufacturers of America $25,847,500
Blue Cross/Blue Shield $24,330,306
American Hospital Assn $22,064,214
American Medical Assn $21,535,000
Alphabet Inc $18,140,000
AT&T Inc $16,780,000
Boeing Co $16,740,000
Open Society Policy Center $16,110,000
DowDuPont $15,877,520
National Assn of Broadcasters $15,460,000
Comcast Corp $15,310,000
Lockheed Martin $14,464,290
Amazon.com $13,000,000
Southern Co $12,970,000
National Retail Federation $12,890,000
NCTA The Internet & Television Assn $12,790,000
Oracle Corp $12,385,000