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This is a steel bolt option for those who don't like the printed / cerrosafe material combo on the bolt in the AWCY 3DP90. I have made this assembly in mild steel, and it weighs 640 grams, so it's heavier than the factory FN bolt which is approx 610 grams. This bolt is made in 2 main steel pieces that pin together with 0.25in hardened steel pins, and is held together with 3 10-24 bolts. It is totally compatible with the original bolt parts from the AWCY release.