FN 36100683 FN 15 DMR3 5.56x45mm NATO 18″ Barrel 30+1, Tungsten Gray Receiver, Black OEM Stock & Grip, Optics Ready

The FN 36100683 FN 15 DMR3 is a 5.56x45mm NATO semi-automatic rifle built for shooters who want enhanced accuracy without the weight of a full competition gun. With its 18-inch hybrid profile barrel, rifle-length gas system, and Geissele two-stage G2S trigger, this FN 15 DMR3 delivers consistent shot-to-shot recovery and minimal muzzle rise. The tungsten gray receiver paired with a black OEM stock and grip makes it optics-ready right out of the box.

Key Features

• FN Hammer-Forged Hybrid Profile Barrel (18-inch, 1:8 twist, chrome lined) — Why it matters: The hammer-forging process creates a denser, more uniform barrel that resists heat buildup and maintains accuracy even during high-volume strings. The 1:8 twist rate stabilizes a wide range of bullet weights from 55 to 77 grains, perfect for both plinking and precision work.
• Geissele Two-Stage G2S Trigger — Why it matters: A crisp, predictable two-stage pull lets you break shots cleanly without disturbing your sight picture. The first stage takes up slack, the second stage breaks at around 4.5 pounds, giving you precise control for tighter groups.
• SureFire ProComp Muzzle Brake — Why it matters: This brake redirects gasses to reduce recoil impulse and muzzle rise significantly. You’ll stay on target for faster follow-up shots, which is especially helpful when teaching new shooters or shooting from the bench.
• Rifle-Length Gas System — Why it matters: A longer gas system reduces bolt carrier velocity and felt recoil, making the rifle smoother and more reliable. It also helps reduce parts wear over time, extending the life of your DMR3.
• Optics Ready with Free-Float M-Lok Handguard — Why it matters: The receiver comes with a flat-top Picatinny rail for mounting any red dot, LPVO, or magnified scope. The free-float handguard protects your barrel from pressure points that could shift your zero, so your optics stay true.

Who It’s For

The FN 15 DMR3 is built for family shooters who want a rifle that can grow with their skills. It’s accurate enough for target shooting and varmint control, yet light enough for a new shooter to handle safely. If you’re teaching a teenager or spouse to shoot, the reduced recoil from the SureFire brake and Geissele trigger makes learning easier. It also suits experienced shooters who want a reliable DMR-style platform without going to a custom build.

Pros and Cons

• Pro: Factory-installed Geissele trigger saves you $150+ over aftermarket upgrades.
• Pro: The chrome-lined barrel resists corrosion and fouling, making cleanup simple after a range day.
• Pro: Tungsten Gray Cerakote finish is durable and reduces glare in bright conditions.
• Con: The OEM stock is functional but lacks an adjustable cheek riser, which may require a cheek pad or aftermarket stock for consistent cheek weld with magnified optics.

Comparison: FN 15 DMR3 vs. Zev Technologies OZ9 vs. Geissele Super Duty

FAQ

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Looking for more precision ARs? Check our AR Rifles and FN Firearms categories. For trigger upgrades, browse Triggers.

Last updated: April 2026

Per FN America specs, over 500,000 FN 15 series rifles have been sold in the U.S. since 2015.