Echo Zulu DefenseX1R556-Ti
5.56mm / .223 suppressor · HUB 1.375x24 interface · specs and compatibility from the manufacturer and independent testers
Notable features
- HUB Compatible
- PEW Science Reviewed
- TBAC Summit Tested
- Full-Auto Rated
- Sealed
length
6″
weight
11.2oz
length
6″
weight
11.2oz
calibers
5.56
material
Titanium
interface
HUB 1.375x24
- Availability
- Discontinued
- Overall length
- 6″
- Diameter
- 1.75″
- Class
- 5.56mm / .223
- n
- 370
- Range
- 0.98″–2.2″
- Median
- 1.6″
- Weight
- 11.2 oz
- Material
- Titanium
- Finish / treatment
- DLC
- Max caliber
- 5.56mm
- Base interface
- HUB 1.375x24
- Full-auto rated
- Yes
- Barrel restriction
- 10.3" minimum
- Minimum barrel length of 10.3 inches. The user guide also states that third-party mounts must be under 1.65 inches in length measured from the top of the HUB interface threads.
- Firing schedule
- 90 rounds of sustained fire with a 10-minute cooldown; do not exceed a suppressor temperature of 900F (titanium fatigue).
- Maintenance
- Sealed (not user serviceable)
Wider than most 5.56mm / .223 suppressors
Diameter compared against the 370 5.56mm / .223 suppressors in the catalog that publish one. Quartile basis; a value inside the middle half carries no note.
Not published by the manufacturer: MSRP.
- Base interface
- HUB 1.375x24
The HUB 1.375x24 is an open standard: 468 mounts and 882 muzzle devices in our catalog fit this suppressor, including Echo Zulu Defense Titanium Direct Thread Mount - Variant C (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, with the same equipment. X1R556-Ti 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
Measured sound results are in the Sound tests section above.
PEW Science · independent test
This suppressor has been independently sound-tested by PEW Science.
Manufacturer claim
- Rated to handle 90 consecutive full-auto rounds with a recommended 10-minute cooldown interval; the user guide adds that suppressor temperature should not exceed 900F because titanium fatigue can occur above that threshold.
- Echo Zulu Defense reports 35+ dB of muzzle reduction and a muzzle sound level of about 133 dB with 5.56 M193 ammunition on a 14.5-inch carbine-length M4A1.
- Echo Zulu Defense contrasts the X1R556-Ti with suppressors that reduce backpressure by venting gas out of the body, arguing that external venting bypasses baffle area and raises sound levels, particularly on bolt-action rifles.
- Patent-pending ReFlow Technology recirculates and controls expanding gases inside the suppressor rather than venting them externally, which Echo Zulu Defense says slows gas velocity, cools and redirects the flow, and stabilizes pressure to reduce blowback.
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- The suppressor body is monolithic and produced by Direct Metal Laser Sintering in titanium, which the company says achieves internal geometries that traditional machining cannot. The HUB mount is traditionally machined.
- Coated with Diamond-Like Carbon on the outside for wear and corrosion resistance and with hexagonal boron nitride on the inside, which the company says lowers friction, improves thermal performance and keeps carbon fouling from sticking to the baffles.
- Described as a hybrid design intended to serve both gas-operated and bolt-action platforms - reduced blowback and ejection-port noise on AR-15-style rifles without giving up the sealed tone and suppression of a bolt-gun can.
- Ships with a direct-thread HUB mount: 1/2-28 at the barrel, 1.375-24 at the HUB interface. The guide specifies copper anti-seize on the threads and 25 ft-lbs of torque.
- Minimum barrel length of 10.3 inches. The user guide also states that third-party mounts must be under 1.65 inches in length measured from the top of the HUB interface threads.
