Generally, Glock 19 10 rd magazines will work with Gen 3 19 magwell and function just fine. We have seen in rare cases some customers not being able to get a 10-round magazine to lock into place. The 10-round magazines are slightly shorter than the standard 15-round magazines. Usually, it is the base pads hitting, the solution for this is:
1. Chamfer the top edge of the base pad to allow for enough clearance for the magazines to engage the mag lock.
2. Purchase some sort of extended +0 base pad. A lot of people have purchased our +0 base pad for Glock 17.
There is a slight difference in the angle of a G17 and G19 magazine so the base pad will look slightly swept back. But unless you are specifically looking for the difference most people don't have an issue with it.
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