Spike's 556nato Upper 16" Chf/fsp

The Spike's 556 NATO Upper 16" CHF/FSP is a complete, ready-to-run upper assembly designed for operators and shooters who demand mil-spec reliability without compromise. Built on a forged upper receiver with a 16-inch chrome-lined, hammer-forged barrel and A2 front sight base, this upper arrives from Spike's factory inspected, tested, and function-checked—ready to mate with a compatible lower receiver and perform immediately.

The 16-inch mid-length barrel gas system balances velocity and handling in a platform optimized for 5.56 NATO/.223 Remington rounds. Chrome-lined bore and chamber resist corrosion during storage and extended use, while the hammer-forged construction ensures barrel durability under sustained fire. The A2 front sight base provides a pinned, non-removable reference point for shooters who prefer iron sight zero without rail-mounted alternatives. Spike's maintains tight tolerances across all contact surfaces—upper-to-lower fit, receiver dimensions, and barrel extension lockup—to ensure consistent function and reliability. Every complete upper and build undergoes function firing before leaving the facility.

This configuration serves patrol, training, and tactical use where a mid-length gas system reduces carrier velocity and impulse compared to carbine-length setups, improving reliability across ammunition variants and extending component life. The 16-inch barrel length meets the legal requirements for unserialized or readily-regulated configurations in most jurisdictions while maintaining effective velocity for 5.56 duty rounds. Operators, law enforcement, military personnel, and serious civilian shooters choose Spike's uppers for the precision fit and battle-proven design that forms the foundation of a dependable rifle system.