This SIG P365 15-round 9MM magazines is compatible with all SIG SAUER P365 and P365XL micro-compact, concealed carry pistol models. The magazine features a unique capacity witness hole that remains visible while the magazine is inserted in a standard P365. This allows full capacity status to be verified without removal of the magazine. The installed baseplate leaves no gap when inserted into a standard P365. The 15-round magazines ships with an additional baseplate that can be easily installed to all SERIES P365 models, including the P365XL.