An A2 sight tower upper is an AR-15 upper receiver assembly featuring a fixed A2 front sight tower, which also serves as the gas block. This classic setup provides a durable, reliable iron sight and is ideal for traditional or military-style builds. It works with AR-15 lower receivers, standard barrels (with appropriate diameter and taper pin holes), handguards, delta ring assemblies, rear sights, gas tubes, and bolt carrier groups, ensuring compatibility with most standard AR-15 components.
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