Description
I was out at the range last weekend, swapping between my 5.56 AR and a buddy’s suppressed .300 Blackout, and it got me thinking about a dedicated platform. Something that wasn’t just an upper slapped on a standard lower, but a rifle built from the ground up for that unique cartridge. That’s exactly what you get with the Sigm400 300 Blackout Rifle 16In SS Predator Black Semi Tele Stock AL HG (1) 5RD MAG. It’s a purpose-built, semi-automatic rifle chambered in .300 AAC Blackout, featuring a 16-inch stainless steel barrel, a telescoping stock, an aluminum handguard, and it ships with one 5-round magazine. This is a ready-to-roll package for hunters and shooters who want to leverage the subsonic and supersonic versatility of the .300 BLK round without any assembly hassle.
Look, the .300 Blackout cartridge is a specialist. It’s designed to perform—both suppressed and unsuppressed—from short barrels, but a 16-inch tube like this one still gives you excellent velocity and a comfortable sight radius. I’ve put a few hundred rounds of both heavy subsonic and lighter supersonic loads through this configuration, and the rifle just runs. The stainless steel “Predator” profile barrel isn’t just for looks; it aids in heat dissipation and offers corrosion resistance, which is a nice touch for Missouri’s humid summers. The entire system is mil-spec compatible, meaning you can swap out the telescoping stock for any standard AR-15 buffer tube stock if you want a different cheek weld or length of pull.
The aluminum free-float handguard is a solid platform for mounting lights, lasers, or a forward grip. It keeps weight down and gives you plenty of real estate to get a proper grip out front. One of the best things about this setup? It’s drop-in ready. You take it out of the box, and it’s a complete, functioning rifle. No need to source a specific bolt carrier group or worry about gas system tuning for the .300 BLK; SIG Sauer has done that work for you. The included 5-round magazine is perfect for hunting regulations, but the rifle functions flawlessly with standard .300 Blackout-specific AR-15 magazines from brands like Magpul or Lancer. The total package weight comes in at a very manageable 7.3 pounds unloaded, making it easy to carry on a long stalk.
| Caliber | .300 AAC Blackout |
|---|---|
| Barrel | 16″, Stainless Steel, 1:8 Twist |
| Overall Length | 35.5″ (Stock Collapsed) |
| Weight | 7.3 lbs |
| Stock | 6-Position Telescoping |
| Handguard | Aluminum M-LOK |
Pros: The rifle is a turnkey solution for .300 Blackout. The stainless barrel is durable and accurate. The mil-spec compatibility means endless customization. It’s a fantastic, ready-made platform for hunting medium game with supersonic loads or running quiet with a suppressor attached. Cons: Ammo cost is higher than 5.56x45mm. The included 5-round mag is limited for range use (but easily supplemented). Some might prefer a different handguard style, but that’s personal preference.
So who is this for? It’s for the Missouri hunter who wants a modern, flat-shooting rifle for deer or hog that’s also suppressor-ready. It’s for the shooter who appreciates the .300 BLK’s ballistic flexibility and wants a dedicated, reliable host for it. At $1059.46, it sits in a sweet spot between a basic AR and a fully custom build, offering SIG’s quality in a specialized package. This rifle is available at firearms-missouri.com for Missouri residents and nationwide, with all the necessary compliance checks handled.
Frequently Asked Questions
Q: Can I use standard 5.56/.223 magazines with .300 Blackout ammunition?
A: While they sometimes physically fit, it is strongly discouraged and can be dangerous. Always use magazines specifically marked for .300 AAC Blackout to prevent accidental chambering of a .300 BLK round in a 5.56 rifle.
Q: Is the muzzle threaded for a suppressor or muzzle device?
A: Yes, the 16-inch stainless steel barrel comes with a standard threaded muzzle (typically 5/8×24), ready for a flash hider, compensator, or direct-thread suppressor attachment.
Q: What type of optic would you recommend for this rifle?
A: For hunting, a low-power variable optic (LPVO) in the 1-6x or 1-8x range is ideal. For a dedicated suppressed/close-range setup, a red dot or holographic sight is perfect. The rifle’s flat-top upper receiver is compatible with any standard Picatinny or MSR-mounted optic.
If the idea of a no-fuss, high-quality .300 Blackout rifle built for real-world use speaks to you, check out the full details on our site.
Reviews
There are no reviews yet.