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Good morning, kinda new to the ar world. after much frustration with light strike issues with my 7.62x39 build i realized that due to inexperience i had installed the hammer spring 180 degrees out. swapped things around and will test it out today hopefully. upon inspection of my grendel build i found same spring install, but this caused no issue with light strike. had to look at my factory built m&p15 to discover this. any other headsup on rookie mistakes i may make? working on an 80% as we speak and just looking to see if there ia nything else i need to watch out for.