Hey all, I recently put together a 7.62x39 AR-15 and I'm have extraction/cycling issues with it. The rifle has a 20 inch barrel with rifle length gas port with an Adams Arms piston system and BCG. The gun fires fine, but is not cycling. I initially thought I might have a misaligned gas port/block, but recently took note of the fact that manually cycling the spent case is overly difficult. I actually have to give the charging handle a good solid pop to extract. The gas piston is moving freely so that isn't the part that is binding. The BCG moves freely and does not stick when cycling on an empty chamber or when cycling live rounds through without firing them. The sticking only occurs upon firing the round. I can see no obvious deformations or damage to the fired casings. The bolt moves freely within the carrier and the spring returns the bolt to proper extension after pressing the bolt into the carrier. Any clues as to what I'm running into here?