TacSol is now offering an aluminum body magazine for the Ruger 10/22. However, they have a disclaimer that they can only "guarantee compatibility with [their] own systems."
Aluminum 10/22 Magazine (https://www.tacticalsol.com/product/r1-rotary-magazine/)
The introductory price is $49.99 each. "[P]ricing may increase in the future."
In Liberty,
Greg Seneff, Sr.
"Bluegrass Colonel"
There is a thread on Rimfire Central about it. One of the people that worked on it is the person that started it.