Today I had the opportunity to test out what dvanncvann and SgtCottle said about the ar15 not firing unless the bolt was fully locked in. I was shooting some suppressed 150 grain subsonic loads and I noticed that the bolt did not make its normal noise when closing. I checked and sure enough the bolt was not completely closed. Since they were real light loads I decided to pull the trigger to see what would happen. The bolt was so close to being closed and fully locked into battery I was sure the round was going to fire. The hammer fell but no boom, dvanncvann and SgtCottle were right on the money
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