You need to work the mags in to get the capacity up. Some STAR M16 mags have been said to hold up to 36 rounds when they are broken in, new they hold 25-28 tops in my experience (22 STAR realcaps...) You could try filling them as far as they will go and letting them sit for a few days, empty them and fill them a few dozen times after that and see if the capacity goes up.
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