The GG3 provides a slot for that chip protect so no magnets are used. Also, there isn't a need to utilize a multimeter to check for continuity since you have the probe wire setup over the GG3 and inexperienced indicator led. Just after milling the non-receiver block around the Ghost https://sethsvuvx.rimmablog.com/32101068/the-smart-trick-of-ghost-gunner-3-that-no-one-is-discussing