Fixed mil-spec typically refers to non-adjustable, military-specification components that meet standard dimensions and tolerances for AR platforms. Common examples include fixed A2 rifle stocks and fixed front sights. These parts work with mil-spec AR-15/AR-10 lower receivers, rifle-length buffer tubes/springs/buffers (for A2 stocks), castle nuts/end plates (where applicable), upper receivers, barrels, and compatible handguards/gas systems. Using fixed mil-spec parts ensures broad compatibility, durability, and consistent fit across standard AR builds.
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