These have been very popular. Get the similar ergonomics to a regular 30-round mag without a mag extender.
https://truenortharms.com/asc-lar-15-5-56-223-10-round-pistol-mag-30-round-body.html
https://truenortharms.com/asc-lar-15-5-56-223-10-round-pistol-mag-30-round-body.html