How about this proposal – since the Gun Control Act of 1968, there has been a minimum age of 21 to buy handguns under US federal law, why not extend that to long guns as well? President Trump publicly proposed this in 2018 (after the Parkland shooting), but soon after dropped the idea under pressure from the NRA and other gun lobby groups. What is wrong with that proposal? It really seems like the NRA is just opposed to any stricter regulation whatsoever.