I just learned that Springfield Armory is selling factory 13-round magazines for their XD-9 Subcompact. Clicky. I don’t know how long they’ve been selling them, but I only just learned about it.
When I bought my XD-9 SC it only had 10-rounders that would fit flush. I had seen some things online about how you could modify magazines to fit more… I think it was take the XD-40 SC magazines, fiddle with the feed lips, and viola, a couple more rounds, but I never wanted to trust that. Range maybe, but for carry and betting your life on it? I wasn’t so sure.
But now Springfield is selling them from the factory. Awesome.