All I can add is my DDLES Lower with YHM upper / CMMG bolt had some issues with 2 C-product mags while function checking them, was fine with 2 others. The mags looked a little different but since I had 12 Metalform mags 32 & 20 rd that function checks fine, I got rid of the C-product mags.
The rode high and caused the bolt to catch up.
I've used nothing but C Products in mine and they have been flawless. There was a problem with the bolt hold open but that turned out to be a bolt catch spring that was too long.
My lower is from the first run and maybe some day I'll SBR it. Right now it has a RR upper.
I like franks & beans
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