This AR-15 castle nut wrench is a single-purpose tool for torquing and staking the castle nut after a buffer-tube or end-plate install. The spanner and pin slots engage the castle nut and end plate so you can tighten down a carbine receiver extension.
Features:
This is a focused, castle-nut-specific tool. If you also need barrel-nut and muzzle-device functions, a full armorer's wrench covers more of the build.
