FN SCAR 16S
The FN SCAR 16S is the civilian semi-automatic version of the US Special Operations Command’s Mk 16 SCAR-L (Special Operations Forces Combat Assault Rifle — Light) — the 5.56 NATO counterpart to the SCAR 17S in .308 Winchester. Both SCAR variants have seen extensive deployment with SOCOM, MARSOC, and allied special operations forces worldwide. The 16S delivers the SCAR platform’s folding stock, side-folding adjustable cheekpiece, free-float MIL-STD-1913 upper rail, and short-stroke gas piston operation in a 5.56 NATO configuration.
Read our full FN SCAR 16S Buying Guide ↓
Short-Stroke Piston in 5.56: Why It Matters
Most AR-15 pattern rifles use direct impingement (DI) — propellant gas vents directly from the barrel and travels back through the gas tube to cycle the bolt carrier. The SCAR 16S uses a short-stroke gas piston system where a piston pushes a rod that cycles the BCG without venting hot gas and carbon into the receiver. The practical advantages over DI for the SCAR’s intended military use are a cleaner-running action under sustained fire, more reliable function in extreme cold when carbon fouling is reduced, and more consistent cycling across a wide range of ammunition. For civilian use where cleaning frequency is the buyer’s choice, the DI vs. piston difference is less critical than in field military use, but the piston system’s clean-running characteristics remain real advantages for suppressed use.
SCAR 16S vs. SCAR 17S: Choosing Your Platform
The SCAR 16S in 5.56 NATO and SCAR 17S in .308 Winchester share the same overall design and folding stock system but are mechanically distinct — parts are not interchangeable between the two. The 16S is lighter, less expensive, and uses less expensive ammunition. The 17S delivers significantly more energy at distance, making it the choice for precision and hunting applications where the SCAR platform’s portability matters at rifle distances. For general purpose, defensive, and range use, the 16S covers the typical buyer’s needs; for hunting large game or precision use beyond 300 yards, the 17S is the appropriate platform.
Folding Stock and Handling
The SCAR 16S’s side-folding stock reduces overall length from 35.5 inches to 27.5 inches when folded, enabling compact storage and transport that conventional AR-15 stocks cannot match. The folded configuration does not allow firing — the stock must be deployed for use — but the reduction in stored length is meaningful for vehicle transport, storage in limited spaces, and discreet carry. The adjustable cheekpiece accommodates different optic heights and shooting positions without aftermarket modifications.
Frequently Asked Questions: FN SCAR 16S
What is the difference between the SCAR 16 and SCAR 17?
The SCAR 16S is chambered in 5.56 NATO; the SCAR 17S is chambered in 7.62 NATO (.308 Winchester). Both share the SCAR’s folding stock, piston operating system, and overall design, but use different caliber-specific lower receivers and are not parts-compatible with each other.
Is the FN SCAR 16S worth the price premium over an AR-15?
For most civilian buyers, a quality AR-15 delivers comparable accuracy and reliability at lower cost. The SCAR’s premium is justified by its military heritage, folding stock, piston operation, and the specific attributes that matter for professional use. Buyers who specifically want a folding stock, piston operation, or the SCAR’s documented military track record will find the premium justified. Buyers who primarily want a reliable 5.56 rifle for range and home defense use will find a premium AR-15 difficult to distinguish from the SCAR in practical use.
What magazines does the SCAR 16S use?
The SCAR 16S uses standard STANAG/AR-15 pattern magazines — compatible with virtually all AR-15 magazines on the market including Magpul PMAGs, mil-spec aluminum magazines, and all standard 5.56 AR magazines.
See Also: FN SCAR 17S • FN America • AR-15 Rifles • .223/5.56 Ammo • Suppressors