And are those the 300blk specific magpul mags?My Magpuls work flawlessly. On a fully loaded mag, and closed bolt you do have to smack it in though. Open bolt no issue.
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I have been running the Lancers in mine. I picked them mainly because I didn't have any Lancers in another caliber and it helps me keep them separate from all my other AR mags due to the look of them. I have not had any problems using mainly the 20 round mags.Of the 2 options specifically designed for 300blk, which mag is better for the xcr? Lancer or Magpul?