A 7.5″ slick side refers to a compact AR-15 upper receiver assembly with a 7.5 inch barrel and a “slick side” design—meaning it lacks a forward assist and sometimes a dust cover for a streamlined, lightweight build. This upper works with AR-15 pistol lower receivers, compatible buffer tubes, handguards, gas systems (usually pistol length), gas blocks, bolt carrier groups, and magazines. It’s ideal for building ultra-compact, maneuverable AR pistols focused on close-quarters use, range shooting, or home defense.
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