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.204 Caliber is one of the AR-15 variations that fits virtually with any standard mil spec AR-15 lower receivers. It is a long range varmint caliber used for small animal hunting.
AR-15 .204 20" Diamond Complete Upper Receiver is your next generation varmint long range build. This upper takes all the standard AR-15 components. No other modifications to your AR-15 rifle is required - uses your standard 5.56 BCG, Charging Handle and magazines. All you need is this up..AR-15 .204 20" Diamond Complete Upper Receiver is your next ge...$599.95