A 4″ quad rail is a compact, four-sided Picatinny rail handguard designed for AR-15 pistols and short-barreled rifles (SBRs) with very short barrels, typically 7″–8.5″. It provides four rail sections (top, bottom, and sides) for mounting accessories like lights, grips, and lasers. The 4″ quad rail works with pistol-length gas systems, compatible upper receivers, low-profile gas blocks, and short barrels, making it ideal for ultra-compact AR builds focused on close-quarters handling and accessory customization.
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