Buy FN 15® M4 UPPER ASSEMBLY.

Looking for a premium vibe? Look no further.

CALIBER: 5.56x45mm
WEIGHT: 4.98 Lbs.
BARREL LENGTH: 16″
OPERATION: DIRECT IMPINGEMENT CARBINE-LENGTH GAS SYSTEM
TWIST RATE: 1:7 RH
SIGHTS: A2-style front, adjustable rear sight

Own a piece of firearm history from the makers of the world’s most battle-proven firearms. The FN 15® Military Collector Series M4 upper receiver assembly is an authentic reproduction of the original, made to FN’s and the U.S. military’s exacting specifications. A 14.7-in. chrome-lined barrel is button-broached, with a 1:7 twist rate, the welded compensator brings the barrel length to 16-in. Cut with a 5.56x45mm NATO chamber to mate with the Carpenter 158 steel bolt, each MIL-SPEC bolt carrier…

Complete your tactical setup with the premium FN 15® M4 UPPER ASSEMBLY. Designed for professional operators and firearms enthusiasts, this high-grade accessory represents our commitment to quality, style, and utility. Just like our famous FN SCAR systems, this product is crafted with premium materials. Stand out at the range and upgrade your performance by shopping through our official shop page, or view the Upper assemblies section to coordinate your accessories.

Beyond standard gear, the FN 15® M4 UPPER ASSEMBLY represents a statement of utility. We design our accessories with impact-resistant polymers and lightweight aluminum, ensuring they endure rough field use. Browse the full range on our online store.

Design Details

MIL-SPEC Materials: High-grade polymers or anodized aluminum ensure this item lasts.
Perfect Fitment: Engineered specifically to mount securely onto your specific model.
Tactical Utility: Designed to speed up reloads, improve grip, or mount optics easily.

Installation and Care Guide

Always verify the firearm is unloaded before installing any accessory. Torque mounting screws to the recommended specifications and apply a drop of thread locker to prevent loosening.

Accessory Type	Mounting Interface	Torque Spec
Optic Mount / Rails	Picatinny / M-LOK	15 – 20 inch-lbs.
Grips / Stocks	Receiver Mount	Hand tight.

Material Specifications

Component	Material	Features
Body / Base	High-Impact Polymer	Textured surface for solid grip.
Hardware	Steel Fasteners	Rust-resistant coating.

Our accessory items are constructed from glass-filled nylon, offering a rugged feel and superior impact resistance. The material is weather-resistant to ensure performance remains consistent in rain or snow conditions.

We utilize steel inserts in high-stress threads to prevent stripping during installation. This makes our mounts and rails durable enough for heavy optics and tactical lights, keeping your setup solid.

The anodized finish we use is formulated to resist scratches and gun cleaning chemicals. This ensures the accessory stays looking professional, maintaining the firearm’s resale value over time.

Our tactical pouches and carrier gear are manufactured with 1000-denier Cordura nylon. We inspect each seam individually for double-stitching and overall finish before packaging, providing excellence for operators.

Our engineering team draws inspiration from modern military requirements and active shooter feedback. This results in accessories that improve weapon handling and target acquisition speed in close quarters combat.

We package our products in secure boxes to reduce shipping damage. Our commitment to quality extends from our raw material selection to our customer service response times, ensuring total satisfaction.

The mounting clamps are designed to fit securely on both MIL-STD 1913 Picatinny and Weaver rails. This dual compatibility ensures you can install the accessory on a wide variety of weapon platforms.

Our holsters are custom-molded to the exact dimensions of the firearm model, providing a secure friction fit and positive retention click when the handgun is fully holstered.

We use heavy-duty steel springs in our magazine extensions to ensure positive feeding up to the last round. This prevents feeding failures during fast tactical reloads.

The weapon lights feature high-output LED emitters that produce a blinding white beam, allowing you to identify targets and search dark areas with complete confidence.

Safety Warnings

Improperly installed accessories can affect firearm function and safety. If you are unsure of installation, consult a certified gunsmith. For inquiries or customer service support, check out our official page for more information.