General Discussion

There are about 16 million AR-15 owners in the US. There may be more than 40 million in circulation. The Washington Post surveyed 400 owners:
Paywall-free link:
https://wapo.st/3zmip4G

Of course, I'd like to see AK-style and AR-15-style semi-automatic weapons banned, but they are so popular I'm not sure the political will can be mustered for a national ban. What I would like to see more than anything is a focus on mandating federal licensing of all currently legal firearms.

I think mustering the political will for licensing is feasible with a concerted effort to do so, but it will require a massive, long-term campaign to combat the propaganda against licensing/certificates.

Licenses should require safety training and background checks and be limited to age 18 and up. In the UK. younger persons can carry a firearm with the following exceptions

If carrying on behalf of the certificate holder (who is aged 18 years or over) and for the certificate holders’ sporting purposes only
As part of an approved club or cadet corps
On a Miniature Rifle Range
Under the supervision of someone over 21 years old
When the shotgun is in a securely fastened gun cover so that it cannot be fired
Unless on private property with the permission of the land owner. It is an offence for someone under this exception to fire any missile beyond the boundary of the premises unless with permission of the adjacent landowner.