I think Marstar is back being a sponsor so we can say their name again
I seen they have some KCI ones, I never used them but google says they are good quality ones. Maybe somebody who has used them before could chime in
https://marstar.ca/product-category/accessories/magazines-stripper-clips/magazines/rifle-magazines/m305/
I have a few of the AIA ones they feed fine but can't get them to hold open on last round but they are 10 rounders so guess take the good with the bad. I'm not a huge fan of the long 20 round mags the 10 round AIA seem to be a perfect size. My gun came with a 5 rounder it sits basically flush and I need like a screwdriver to pry it out total pain in the arse !
https://marstar.ca/product-category/accessories/magazines-stripper-clips/magazines/rifle-magazines/m305/
I have a few of the AIA ones they feed fine but can't get them to hold open on last round but they are 10 rounders so guess take the good with the bad. I'm not a huge fan of the long 20 round mags the 10 round AIA seem to be a perfect size. My gun came with a 5 rounder it sits basically flush and I need like a screwdriver to pry it out total pain in the arse !