What is a good brand of 6.5 Grendel Mags? I'd like to pick up some 10-17 rounders for my recent build. I had placed an order with Alexander Arms back in the middle of November and was told I would have them before Christmas. Today I received a follow up email and said it would be the middle of February. Very poor manufacturing technique if you ask me to have that long of a back order. I know that C-Products, ASC, Stoner and maybe a few others all make a compatible mag. Thoughts?