I think he wants to confiscate anything AR-15 related, or as he mistakenly calls them "assault weapons".
Probably including your 10-22's as well because they can hold mega "clips". We call them magazines.
I bet you're probably right. I know Booker's thrown wild idea all over to see what may stick, and I'm certainly no fan of his. But the original article was (deliberately) vague with omission of details like just incite uncertainty, rage, and get some clicks.
Not that that ever happens around here