Sons of Liberty Gun Works Castle Nut Features The Sons of Liberty Gun Works Castle Nut is machined from 17-4 stainless steel a material chosen for its strength and resistance to corrosion over standard mild steel parts. Class 3A threads ensure the nut engages properly with mil-spec buffer tubes giving builders confidence in a precise reliable fit. Six deep staking notches allow the nut to be properly staked once installed locking it in place and preventing it from backing off under recoil. The nut s extended length also gives a staking punch more surface area to work with during installation. Nitride treatment finishes the Castle Nut in a durable black coating that resists wear and corrosion through repeated handling and range use. Sons of Liberty Gun Works builds its small parts to fit most mil-spec AR-pattern firearms making this nut a drop-in option for a wide range of builds. Whether assembling a competition rifle a duty carbine or a next home-build project having a reliable castle nut from a trusted manufacturer matters for long-term function. The Sons of Liberty Gun Works Castle Nut is a small but essential upgrade for any serious AR-15 build. Sons Of Liberty Gun Works Castle Nut Specifications Manufacturer: Sons Of Liberty Gun Works Model: Castle Nut Type: Castle Nut Color: Black Description: Class 3A Threads Material: 17-4 Stainless Steel Finish: Nitride Available At: GrabAGun