On the SIG Sauer how many bullets does the mag hold?

Linda Tudor
E29R-9-SEL has a capacity of 15rd. It uses either MAG-229-9-15-E2 or MAG-229-9-10-E2 (for low capacity states). The E in the part number indicates it is high capacity (over 10rd) and if the part number were 229R-9-SEL that would be a 10rd version.
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