I know I had the same issue on my Legacy M1a. 3 blinks and no smoke from main stack. I had not run it in a long time. Before that no issues. But I just put in some eliminator in it to free it up, let it sit overnight and next day it works fine. I know everyone wants to send it in to get smoke unit replaced, but sometimes it is just a little stuck from residue and there is no issue.
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