This 3D printed Steel Magwell is designed for the Sig P320 AGX Grip Module. It has a small footprint & is designed for concealed carry. This magwell requires the matching baseplates or 21 round mag baseplates. Stock P320 17 round baseplates will not fit. Note this magwell is compatible with all baseplates designed to fit with a P320 magwell. P229 baseplates are also compatible with this magwell.