Knights Armament SR-15 KS-4 5.56 NATO SEMI-AUTO RIFLE

Knights Armament SR-15 KS-4 5.56 NATO 16” Rifle | Premium AR-15 Performance 

Elite-tier reliability meets cutting-edge refinement — the Knight’s Armament (KAC) SR-15 KS-4 (UPC 819064019244) is a next-generation 5.56 NATO rifle built for serious shooters, professionals, and collectors who demand uncompromising performance. This isn’t just another AR-15; it’s KAC’s latest evolution of the battle-proven SR-15 platform, featuring premium components engineered for superior durability, accuracy, and modularity.

The KS-4 delivers smooth operation, reduced recoil, and exceptional longevity thanks to KAC’s proprietary advancements — ideal for duty use, competition, training, or as a top-tier defensive/home rifle.

The SR-15 KS-4 stands as one of the finest factory AR platforms available — trusted by those who know the difference between good and exceptional.

At Black Market Arms, we pride ourselves on carrying premium firearms like Knights Armament for discerning customers. Family-owned in Missouri, we offer expert service, competitive pricing, fast & secure shipping, and a commitment to quality you can trust.

Secure your Knights Armament SR-15 KS-4 today — experience the pinnacle of AR-15 engineering from a legendary manufacturer.

Features:

Caliber: 5.56 NATO / .223 Rem — versatile, accurate, and widely available
Barrel: 16” cold hammer-forged, chrome-lined, lightweight profile with 1:7 twist for optimal velocity and accuracy
Handguard: 15” URX 6 free-float M-LOK system — self-indexing, shift-resistant, with full-length top rail and ample accessory mounting space (perfect for optics, NVGs, lights, and suppressors)
Bolt Carrier Group: Advanced E3.2 bolt with dual ejectors, lobster-tail extractor, and strengthened lugs for enhanced reliability (especially suppressed) and extended service life
Gas System: Proprietary mid-length for smoother cycling and reduced felt recoil
Controls: Fully ambidextrous (bolt release, mag release, safety selector) for intuitive left- or right-handed operation
Trigger: Factory two-stage match trigger for crisp, precise pulls
Muzzle Device: KAC 3-prong flash hider / QDC-compatible suppressor mount
Sights: KAC micro flip-up front and rear
Stock: Adjustable polymer for customizable length of pull
Capacity: Includes one 30-round magazine
Weight: ~6.55–6.62 lbs | Overall Length: 32.5”–35.75”
Finish: Durable matte black

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