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One-hundred and fifty flawless rounds with Blazer brass 115gr today. One Mecgar magazine doesn't lock the slide.
Was that with an 18 round mag?
Yup. The other 18 rounders worked just fine.
Does it look any different than the other Mec-gars? There's a little tab on the left front of the follower that pushes the slide release lever up when the mag is empty. You'll see a cutout in the magazine body for the tab. On all of mine, the tab is slightly proud of the magazine body when the mag is empty. Also the left side of the follower should reach very close to the top of the feed lips, maybe 1/32" from the top. If it doesn't, check for a misshaped follower, bent feed lips or a weak spring.
If all of that looks good, mark the bad mag and swap followers with a known good one. See if the failure repeats in the marked mag or the other one. Or if it's your lucky day, neither! If the failure repeats on the bad mag, switch springs also and try again.
If the problem were with the baseplate you probably would have noticed that right away.