The FN FN15 SBR (brand part no. 36-100579) is a 5.56 NATO short-barreled rifle built from a MIL-SPEC foundation, pairing an HP/MPI-tested M16-style bolt carrier group with a mid-length gas system and H buffer for reliable cycling. FN cold hammer-forges and chrome-lines the 11.5-inch barrel for accuracy and longevity, and the rifle ships with a Magpul flip-up rear sight. The FN15 SBR favors shooters who want a duty-grade, compact 5.56 platform.

Key Specifications

• Chambered in 5.56 NATO / .223 Remington.
• Wears an 11.5-inch chrome-lined, cold hammer-forged barrel.
• Feeds from a 30-round capacity magazine.
• Runs a mid-length gas system with an H buffer for reliable cycling.
• Equipped with a Magpul flip-up rear sight.
• Built around an HP/MPI-tested M16-style bolt carrier group.
• Operates as a semi-auto action.

Frequently Asked Questions

Is this an NFA item? Yes. As a short-barreled rifle (SBR), it's a Title II firearm requiring an approved ATF Form 4 and transfer through an NFA-licensed dealer.

How long is the barrel? 11.5 inches.

What sights does it include? A Magpul flip-up rear sight.

Buy the FN FN15 SBR, 5.56mm NATO, 11.5-Inch

This is a Title II item regulated under the National Firearms Act. Purchase requires an approved ATF Form 4, no federal transfer tax, and transfer through a licensed NFA (SOT/Class 3) dealer, with an extended federal approval wait before delivery. Order through FN America‘s short barrel rifles lineup and our Lubbock, Texas team will walk you through the transfer process.