I just got a Stag Arms model 3 and there was no donut on the extractor. I looked at the manual for the model 3 and there is no mention of the donut nor is it pictured. I then looked at my manual for my LMT and there is no mention nor is it pictured. My LMT has a donut. Stag Arms is closed until Monday.
Can anyone shine any light on the purpose of the donut.