FN M249S Semi-Auto Rifle 5.56 NATO 18.5 in FDE
About this product
The FN M249S Semi-Auto Rifle is a civilian-legal semi-automatic version of the military-proven M249 SAW platform, chambered in 5.56 NATO and built for reliability and practical use. Developed by FN Herstal, this rifle maintains the core functionality and durability of its full-auto predecessor while complying with Title I firearm regulations. Its Flat Dark Earth finish and versatile feed system make it a standout option for shooters seeking a support-role inspired platform.
What is the FN M249S used for?
The FN M249S is primarily used for dynamic range training, practical shooting sports, and collector applications where its belt-fed capability and military heritage are valued. It excels in scenarios requiring sustained fire—such as multi-gun competitions or extended training drills—thanks to its 18.5-inch chrome-lined barrel and ability to feed from both magazines and disintegrating belts. At 16.3 lb unloaded, it's manageable for shooters who prioritize stability over portability.
How does the FN M249S compare to the Stevens 334 Rifle?
The FN M249S outperforms the Stevens 334 in rapid-fire scenarios and ammunition capacity, but the Stevens 334 in .308 Win offers superior long-range precision and lighter weight at 7.1 lb. Where the M249S supports belt-fed and magazine-fed 5.56 NATO rounds with a cyclic rate limited by semi-auto operation, the Stevens 334 is a bolt-action rifle optimized for accuracy at 500+ yards. Choose the M249S for volume fire and tactical training; the Stevens 334 for hunting or precision shooting.
What does it weigh and what are the dimensions?
The FN M249S weighs 16.3 lb empty and measures 40.9 inches in overall length with the stock extended. Its 18.5-inch barrel contributes to a balanced center of gravity, while the folding bipod adds 2.1 lb but enhances stability during prone or supported firing. Compared to lighter semi-autos like the Stevens 334, the M249S demands more strength for extended carry but offers unmatched control during strings of fire.
Who is this NOT for?
The FN M249S is not for beginners or shooters prioritizing lightweight maneuverability, given its 16.3 lb weight and specialized operation. It requires familiarity with belt-fed systems and routine maintenance to prevent malfunctions—expect to spend 15-20 minutes cleaning after a 500-round session. If you're seeking a straightforward, lightweight rifle for casual plinking, consider a Stevens 334 in .243 Win instead.
What's in the box?
The FN M249S ships with one 30-round steel magazine, a folding bipod, a folding carry handle, and a user manual covering NFA-compliant modifications. Unlike many sporting rifles, it does not include a cleaning kit or linked ammunition, reflecting its niche as a professional-grade system. The box dimensions are 42x12x8 inches to accommodate the rifle's 40.9-inch length and accessories.
Is the FN M249S worth it at $10,299?
At $10,299, the FN M249S justifies its cost for serious enthusiasts and trainers who need its unique belt-fed capability and military-grade construction. It's over 3 times the price of a typical AR-15 platform but delivers unmatched durability and versatility for high-volume shooting. If your budget is under $5,000 or you prefer simplicity, opt for a dedicated magazine-fed rifle; otherwise, the M249S is a rare investment in a proven system.
Specs at a glance
Video review
Pros & cons
What works
- Weighs 16.3 lb — provides stable platform for rapid fire
- Accepts both M4 magazines and 200-round belts — unparalleled versatility
- 18.5-inch chrome-lined barrel — extends barrel life to 20,000+ rounds
- Includes folding bipod — adds 2.1 lb but eliminates need for aftermarket purchase
Trade-offs
- No optics included — requires $300+ investment for red dot or scope
- 16.3 lb weight — 9.2 lb heavier than Stevens 334, limits mobility
- 30-day return window with 15% fee — stricter than industry standard 45-day policies
Expert review
Key attributes
| upc | 845737015091 |
| manufacturer | FN America / FN Herstal |
| manufacturer part number | 46-100170 |
| action | Semi-Auto |
| atf type | MODERN SPORTING RIFLE |
| barrel finish | Black |
| barrel length | 18.50" |
| caliber/gauge | .223 REM/5.56 NATO |
| capacity | 30 + 1 |
| color | Flat Dark Earth |
| length | 40.7500 |
| model | M249S |
| number of magazines | 1 30rd GI & 200 Links with Box |
| package height | 8.0 |
| package width | 12.3 |
| product type | Rifle |
| safety | Crossbolt |
| shipping weight | 30.0 |
| sights | Iron Sights w/ top 1913 Rail |
| sights type | Adjustable Sights |
| state restriction (ca) | NO DIRECT SHIP TO CALIFORNIA |
| state restriction (il) | NO SALE TO ILLINOIS PICA |
| state restriction (or) | NO SALE TO OREGON |
| state restriction (ri) | NO DIRECT SHIP TO RHODE ISLAND |
| state restriction (wa) | NO DIRECT SHIP TO WASHINGTON |
| magazine included | 1 x 30-Round |
| units per box | 1 |
Frequently asked questions
- Is it compatible with M4/M16 magazines?
- Yes, the FN M249S accepts standard STANAG-pattern M4/M16 magazines, including PMAGs and USGI aluminum mags. It also feeds from disintegrating link belts up to 200 rounds without modification. For optimal reliability, FN recommends using their proprietary magazines or belts.
- Does it fit in a standard rifle case?
- No, at 40.9 inches long and 12 inches wide with the bipod folded, it requires a case at least 42 inches internally. Most standard 36-inch cases won't accommodate it; consider a Pelican 1750 or similar hard case for transport.
- How long does shipping take?
- Shipping typically takes 7-10 business days for in-stock items, plus FFL processing time. Expedited options are available for an additional $75, reducing transit to 3-5 days via FedEx Priority.
- Can I return it if it doesn't fit my needs?
- Returns are accepted within 30 days for unused items, but a 15% restocking fee applies due to the firearm's high value and regulatory handling. All returns must comply with Ironclad Armory's FFL transfer policies.
- Does this work with a suppressor?
- Yes, the 18.5-inch barrel is threaded 1/2x28 TPI, compatible with most 5.56 suppressors. However, the gas system may require adjustment for optimal function; plan for a 200-round break-in period before suppressing.