Echo Zulu Spring Loaded Center Punch Stake your AR's castle nuts faster, safer, & more consistently with Tango Uniform's new Echo Zulu Castle Nut System. This premium spring loaded center punch features a large, injection molded comfort grip and the knurl textured body has a chrome plated finish for a long-life. The staking punch has a straight-wall design so it won't tilt inside the bi-directional staking guide, included in the Echo Zulu Starter Kit, or the Echo Zulu armorer's wrench. It's made from 17-4 stainless steel and finished in long duration, diamond hard black nitride. When combined with an Echo Zulu castle nut and a precisio Mfg: Tango Uniform