FailZero M16/4 Bolt and Carrier Group & Trigger Basic Kit Review

FailZero M16/4 Bolt and Carrier Group & Trigger Basic Kit Review

About ten years ago I did some consulting work for the Lawrence Livermore National Laboratory to help develop a cutter for use in cutting and testing stored solid explosives.  One of the reasons I was selected was my background working with and testing advanced metal treatments such as cryo…