Geissele's Ultra Duty Lower Parts Kit was designed to accommodate the most discerning shooters, and comes with all the necessary parts needed to rebuild or complete your lower receiver. Each component of this kit features proprietary Geissele designs, and is meticulously machined from top-quality stainless steel to provide a long service life of heavy use. This kit includes: Maritime Bolt CatchAmbidextrous Super Configurable SafetyTakedown pinsMag release buttonUltra Precision Trigger Guard Geissele Ultra Duty DDC Lower Parts Kit w/NO Grip 05-435S