Taurus : PG-HCGX+.
PLUS ONE Magazine Extension For Taurus GX4 and GX4 XL
This unit replaces the magazine base plate on the Taurus GX4 and GX4 XL. This extension adds one round capacity to the magazine and adds approximately 3/4" inch additional gripping surface. It also incorporates a texture similar to the frame. This product utilizes the patented PearceLock attachment mechanism.(US 10,996,010 B2)