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There are lightweight ARs, and then there's the FosTecH Stealth Raptor. FosTecH built this rifle around a proprietary billet magnesium-aluminum alloy that cuts roughly 33% of the weight compared to standard aluminum while adding about 30% more strength. That's not just marketing math — it means you're holding a sub-5.13-lb rifle that isn't giving up anything structurally to get there. The OD Green Cerakote finish ties it all together with a look that's as distinctive as the engineering underneath it.
The receivers, upper, lower, and Mach-1 handguard are all machined from that same advanced alloy, so the weight savings carry through the entire chassis, not just one component. The 16" Mach-1 rail is M-LOK compatible and runs the full length of the barrel, giving you a clean, fully shrouded profile and a ton of real estate for lights, grips, or a bipod without any gaps or misaligned rail segments. The Picatinny rail on the upper lines up perfectly with the handguard, so optic mounting is dead simple. A FosTecH low-mass nickel boron BCG keeps the bolt slick and corrosion-resistant, and the mid-length gas system paired with a .625 low-profile gas block keeps cycling smooth with reduced felt recoil and muzzle rise. Anti-walk trigger pins and the FosTecH Sabre comfort grip round out a build that's been thought through to the small details.
The heart of the Raptor's accuracy is the 16" Faxon Gunner Profile barrel, chambered in 5.56 NATO and built from 4150 CMV steel with a 1-in-8 twist rate. That twist is a solid all-around choice — it stabilizes everything from lightweight 55-grain FMJs up through heavier 77-grain match bullets without complaint. This specific configuration (MPN: ST-RPR-GR5DH2-S21MS) comes equipped with a single-stage trigger. The rifle ships with flip-up iron sights already installed, so you're not scrambling for a backup sighting system before your first range trip.
The Stealth Raptor is a great fit for anyone who wants a premium, no-compromise AR-15 that won't wear you out on a long day at the range or in the field. It also makes a serious home defense option thanks to the compact handling you get from sub-6-lb weight in a full-length rifle package. Made in the USA and backed by FosTecH's warranty, this one ships complete with a 30-round magazine and a carry case — ready to go right out of the box.
FosTecH's proprietary alloy delivers roughly 33% less weight and about 30% more strength compared to traditional aircraft-grade 7075 aluminum. In practical terms, that means a complete rifle that weighs under 5.13 lbs without sacrificing the structural integrity you'd expect from a full-duty AR-15. The receivers are billet-cut, not forged or cast, which adds to their precision and consistency.
This model (MPN: ST-RPR-GR5DH2-S21MS) comes equipped with a single-stage trigger. FosTecH also offers the Stealth Raptor with their well-known Echo AR II binary trigger in other configurations, but this particular OD Green Mach-1 build ships with the single-stage setup. The trigger assembly is secured with FosTecH anti-walk pins for a stable, rattle-free fit.
Yes, a 1:8 twist is widely regarded as the most versatile twist rate for 5.56 NATO and .223 Rem. It stabilizes standard 55-grain loads reliably, and it also handles heavier projectiles in the 62-77 grain range without over-spinning lighter bullets. Whether you're running bulk FMJs at the range or quality defensive or match loads, 1:8 is a strong all-around choice.
Yes, the 16" Mach-1 handguard is fully M-LOK compatible, which means it works with the massive ecosystem of M-LOK lights, grips, bipod adapters, and rail sections available today. The handguard runs the full length of the barrel, providing a clean barrel shroud and plenty of attachment points along the 3, 6, and 9 o'clock positions. The Picatinny rail on the upper receiver also aligns seamlessly with the top of the handguard for uninterrupted optic rail.
The Stealth Raptor ships ready to run — it includes the rifle, one 30-round magazine, flip-up iron sights already installed on the rifle, the FosTecH Strake muzzle device, and a plastic carry case. Owner's manual and warranty cards are also included. You won't need to buy a case or sights separately just to get to the range.
For the most part, yes. FosTecH designed the Stealth Series to maintain compatibility with standard AR-15 components, so standard triggers, grips, stocks, and upper/lower parts should interchange normally. The handguard and receivers are FosTecH-specific due to the proprietary alloy and design, but anything that attaches to a mil-spec AR lower or upper should work fine. Always verify fitment with any aftermarket components before purchasing.
| UPC | 082652082108 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | ST-RPR-GR5DH2-S21MS |
| Shipping Weight | 11.1 |
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