The Magpul GL Enhanced Magazine Well is designed to fully enhance and ensure positive magazine insertion in high stress scenarios. Ii is compatible with Gen4 Glock 19/23/32/38 and compatible with Magpul, OEM and most aftermarket magazine floor plates, as well as most common after-market magazine extensions. Recent generations of reduced capacity 10rd factory Glock magazines have several dimensional differences which may interfere with any magazine well. Including the Magpul GL Enhanced Magazine Well. Some large aftermarket floorplates may also interfere.