If you want something that would be a bit less likely to be taken away (and I say a bit), a
Ruger Mini-14 or Mini-30 is similar to an AR, but in a traditional rifle stock. I think the traditional montecarlo furniture (evern more so in wood) makes it a little safer from confiscation, since the antis are fixated on the looks of the AR. They are mag fed, and legal in Comifornia! Here is a picture, doesn't it look "safe"?
It looks like it could never hurt a peep! If you don't believe me, ask John "Hannibal" from the A Team, who would shoot it profusely but never kill anybody with it:
Other solutions:
although pricier than a regular AR lower, a rifle lower made for AR upper such as Fightlite SCR:
https://www.riflegear.com/p-8298-fightlite-scr-lower-receiver-assembly-monte-carlo.aspx#mz-expanded-view-763282862200
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or... give up the semi-auto altogether and go to some kind of
straight pull AR. These I reckon would be very very difficult to legislate against, and a few examples are:
Troy's industries' straight pull (around $1100):
https://worldoftroy.com/product/troy-16-straight-pull-rifle/
or the straight pull Lantac Raven, which apparently is made to be legal in the UK:
https://www.lannertactical.com/straight-pull-raven-ar15-rifle
I hope this helps, best of luck with your decision!