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Dead Air took their time getting into the dedicated 5.56 game, and the Sierra 5 shows why the wait was worth it. Instead of chasing the lightest number on a spec sheet, they built this can around a fully welded stack of Stellite (Cobalt 6) baffles wrapped in a 17-4 PH stainless steel tube. Stellite is the stuff that laughs at heat and erosion, which is exactly what you want sitting at the end of a short-barreled 5.56 gun running a heavy firing schedule. The result is a suppressor that is full-auto rated with zero barrel length restrictions, finished in high-temp black Cerakote with aggressive knurling along the body so you can get a grip on it with gloves or a wrap in the way.
This configuration comes set up with Dead Air's proven KeyMo quick-detach system, including the adapter and a 1/2-28 KeyMo flash hider in the box. Leave the flash hider on your rifle, and the can spins on and locks up tight in seconds with rock-solid repeatability. The rear of the suppressor uses the industry-standard 1.375-24 HUB pattern, so if you ever want to switch to Xeno mounts or a direct thread setup down the road, you can swap adapters instead of buying a whole new can.
Bare, the Sierra 5 measures just 4.87 inches and 10.8 ounces. With the KeyMo adapter installed you're looking at 6.27 inches and 15.4 ounces, which keeps things compact and manageable even on a 10.5 inch pistol build. The baffle geometry was designed specifically for 5.56 pressures, balancing sound reduction with low blowback and a short pressure impulse, so you get less gas in the face than a lot of cans in this class. The flash hider front cap knocks down muzzle flash noticeably, a detail that matters if you spend time behind night vision or just shoot at dusk.
If you want one 5.56 suppressor that can live on a duty rifle, a truck gun, or a range toy without babying it, this is the one to grab.
Yes. The Sierra 5 is full-auto rated with no barrel length restrictions, thanks to its welded Stellite baffle core and stainless steel tube. Dead Air built this can specifically for heavy firing schedules, so short barrels and hot mag dumps are exactly what it was designed to handle.
This package includes the KeyMo adapter already set up on the suppressor plus a DA301 1/2-28 KeyMo flash hider for your muzzle. Thread the flash hider onto your barrel and the can locks on and off in seconds. If you want to suppress multiple rifles, just pick up extra KeyMo muzzle devices for each host.
It is. The rear of the Sierra 5 uses the industry-standard 1.375-24 HUB thread pattern, so you can swap the KeyMo adapter for a Xeno mount, a direct thread adapter, or other HUB-pattern mounts down the road. That flexibility means the can grows with your collection instead of locking you into one setup.
The baffle geometry was purpose-built for 5.56 pressures with a low-blowback, short pressure impulse design, so you get noticeably less gas back through the action than many competing cans. The included flash hider front cap also does a great job cutting visible muzzle flash, which is a real plus for low-light shooting or night vision work.
| UPC | 810128160001 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | SIERRA5KM |
| Caliber/Gauge | .223 REM/5.56 NATO |
| Color | Black |
| Length | 4.8700 |
| Model | |
| Product Type | Suppressor |
| Shipping Weight | 2.0 |
| Thread Pattern | 1/2"-28 tpi |
| Style | Quick Detach |
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