Daniel Defense
Classic 14.5" M4A1 configuration with pinned front sight post and quad rail.
The Daniel Defense M4A1 FSP Upper Receiver Group delivers the classic M4A1 configuration with a pinned front sight post (FSP) and traditional quad rail handguard. This setup mirrors the standard US military M4A1 configuration, providing co-witnessed iron sights and proven reliability that has served armed forces worldwide.
The 14.5" cold hammer forged barrel features a Surefire SF3P muzzle device pinned and welded to achieve 16" overall barrel length for non-NFA compliance. The carbine-length gas system with pinned front sight gas block provides the rugged reliability expected from military-pattern rifles. The quad rail handguard offers Picatinny rails at all four positions for maximum accessory mounting flexibility.
This configuration is ideal for shooters who prefer the classic military aesthetic and want backup iron sights without additional mounting hardware. The FSP serves as a robust, zero-retaining front sight that has proven itself in combat conditions worldwide.
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Add the Daniel Defense M4A1 FSP Upper Receiver Group 14.5" to your build and see how it enhances your platform.