As others have stated 10 round mags are for states like CA which limit capacity to 10.
The factory mags for BHPs stop at 13 for flush fit mags. A factory spec BHP is either a 13+1 or a 10+1 9mm handgun.
Mecgar makes 15 round mags which have a different follower that allows for the extra 2 rounds. Some people do not trust this design because the follower can tilt and jam but I have never had an issue with them and use them in all of my BHPs. IMHO Megars are the way to go because they are reliable, are the oem manufacturer and are cheaper than factory mags.
Mecgar also makes a 20 round mag but I have no experience with those.
The factory mags for BHPs stop at 13 for flush fit mags. A factory spec BHP is either a 13+1 or a 10+1 9mm handgun.
Mecgar makes 15 round mags which have a different follower that allows for the extra 2 rounds. Some people do not trust this design because the follower can tilt and jam but I have never had an issue with them and use them in all of my BHPs. IMHO Megars are the way to go because they are reliable, are the oem manufacturer and are cheaper than factory mags.
Mecgar also makes a 20 round mag but I have no experience with those.