Beretta APX semiautomatic pistol, with removable, serialized chassis frame. Easy to modify and maintain with replaceable grip frame housings. The APX's extremely low profile, snagfree design makes it easy to draw from the holster. The light, durable grip frame housing employs modern thermoplastic technology. The squared-off trigger guard offers a support surface and accessory mounting interface with grooved finger rests in the grip to guarantee a secure and firm hold. The APX FDE RDO incorporates the ability to easily mount a Red Dot Optic integrally on your slide and a factory installed Threaded Barrel. standard Picatinny rail under the barrel for convenient mounting of accessories.