The concentrated dye will make the imperfections visible for quality control. Under charge, the dye is attracted to imperfections in the metal which create a distortion in the magnetic field. During MPI testing, the BCG is coated with a magnetic dye and an electrical charge is applied. Magnetic particle inspection is used to ensure there are no microscopic cracks or fissures in the bolt carrier group, which could cause it to fail during operation. Here's what to look for if you want the best BCG for your AR-15: Magnetic Particle Inspection (MPI) You've probably looked at a few bolt carriers and came across buzzwords like "HPT tested" or "chrome-lined key". By the end, you'll know everything you need to pick out the right bolt carrier group for your custom rifle. Learn what a "full-auto" BCG really is, what MPI testing and other acronyms mean, and see how the BCG functions with animated illustrations. This builder's guide explains the operation and individual components of the AR-15 bolt carrier group. It takes the brunt of the recoil produced by the gas system while reliably cycling and ejecting ammunition. The bolt carrier group (BCG) is one of the most important moving parts in the AR-15.
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