ReplicatorNixis 556 K
5.56mm / .223 suppressor · HUB 1.375x24 interface · specs and compatibility from the manufacturer
Notable features
- HUB Compatible
- Low Backpressure
- TBAC Summit Tested
- Full-Auto Rated
- Sealed
length
5.5″
weight
12.3oz
MSRP
$990
length
5.5″
weight
12.3oz
calibers
5.56
material
Inconel
interface
HUB 1.375x24
MSRP
$990
- Overall length
- 5.5″
- Diameter
- 1.62″
- Weight
- 12.3 oz
- Material
- Additive Manufactured Super-Nickel Alloy (aerospace Inconel variant)
- Finish / treatment
- Cerakote
- Max caliber
- 5.56mm / .223
- Base interface
- HUB 1.375x24
- Front cap
- Fixed
- Backpressure
- Low
- Full-auto rated
- Yes
- Maintenance
- Sealed (not user serviceable)
- MSRP
- $990
Prices are manufacturer's suggested retail (MSRP). What you pay may differ.
- Base interface
- HUB 1.375x24
- Front cap
- Fixed
The HUB 1.375x24 is an open standard: 415 mounts and 818 muzzle devices in our catalog fit this suppressor, including Replicator Direct Thread Adapter (1/2x28), AAC 51T S.T.A.M.P. Mount and AB Suppressor AB Raptor Adapter. You aren't locked into one manufacturer's parts.
Which ones fit your barrel and host?
Check in the BuilderThe Thunder Beast Silencer Summit fires every suppressor entered on the same gun, on the same day, with the same equipment. Nixis 556 K was measured in 1 test. Figures can only be compared with others from the same test, so each one links to everything else fired on that gun.
Gas-operated rifles and carbines
Measurements published by Thunder Beast Arms Corp. How to read these
Manufacturer claim
- Full-auto rated for extreme duty use.
- Pressure rated up to 5.56 mm.
- SE Leq 128 dBA, ML 140 dBA — Silencer Summit 2025 rating, 5.56.
- Reduced backpressure design with excellent sound and flash suppression.
Show all 19 ▾ ▴
- The Nixis K was specifically designed to be a short, lightweight can while still maintaining a full auto rating.
- Zero internal coatings and zero welds to fail, combined with an aerospace Inconel variant allows for full auto, extreme duty use.
- HUB industry standard 1.375x24 threads, so it works with any HUB compatible mount.
- Cerakote color options: C-102 Graphite Black (up to 1,800°F), C-267 Magpul FDE (up to 1,200°F)
- Mounts tested by Replicator: its own direct thread adapter, Breek LOK 3QD, Dead Air KeyMo, Griffin Armament DUAL-LOK and SilencerCo ASR Bravo. Replicator notes it cannot guarantee third-party designs will work in future due to changes in manufacturing or quality control.
- Replicator was previously known as RR Weapons. The product manuals state the company is going through a name change, so a product may be labelled either way.
- Additive Manufactured Super-Nickel Titanium Alloy (Aerospace proven Inconel variant that is stronger than normal Inconel by almost 2.4 times at 1492°F)
- Monolithic construction: the baffles and outer tube are printed as one piece, so there are no welds to fail and there are zero internal coatings to fail.
- 3,000 to 10,000 rounds between cleanings.
- Short-barreled rifles and compact weapon systems where added length matters.
- Law enforcement operations and close-quarters work.
- Purpose built for 5.56 mm platforms like the AR-15. It may also be used on a 5.7 platform such as a PS90 or Kel-Tec P50, or on pistols like the FN Five-seveN or PSA Rock — semi-automatic pistols almost always need a Nielsen/booster device.
- Ships with a wrench and a 2.2 oz direct-thread adapter — 1/2x28, or 5/8x24 on .30 cal. Rear thread is the industry-standard HUB 1.375x24, so any HUB mount fits.
- Temperature rating: suggested 1200F or lower for heat transfer to the mount and barrel; 1500F maximum suppressor temperature.
- Minimum barrel length: no restrictions.