Featuring a drop-in design for simple, tool-free installation, the Pearce Grip +1/2 Magazine Extension for Gen 4-5 Glock® 26, 27, 33 pistols features durable yet lightweight polymer construction for lasting performance and reliable shock resistance. This mag extension offers +1 or +2 rounds of ammunition for superior firepower, while a molded finger groove with aggressive grip texturing maximizes comfort and control. Compatible with Glock factory magazines ONLY (not included).