SKU

800100202 (No Mount) · 800100202-K12280 (Variant C 1/2-28) · 800100202-K58240 (Variant C 5/8-24)

Material

Grade 23 Ti-6Al-4V ELI (titanium)

Weight

12.5 oz

Interface

1.375″-24 HUB

Maximum bullet diameter

6mm / .243 (0.243″)

Use rating

Bolt-action and precision use. Not full-auto rated.

Maximum sustained wall temperature

800°F

Finish

High-Temp Cerakote (Coyote Tan)

Manufacture

Direct Metal Laser Sintering (DMLS), sealed monolithic construction

Manufactured by

Echo Zulu Defense, Sturgis, SD, USA

• Confirm the firearm is unloaded before installing, removing, or servicing the suppressor.
• Verify bore alignment with an alignment rod in the suppressor’s caliber before
  the first shot on a new host, and again after any change of mount, barrel, or firearm. For this
  suppressor, use a 6mm / .243 rod.
• Use only SAAMI- or CIP-compliant ammunition loaded to published pressure specifications.
• Do not fire sabot ammunition through this suppressor.
• Do not fire with any obstruction in the bore.
• Wear hearing protection. A suppressor reduces the report; it does not make a
  firearm safe for unprotected hearing in all conditions.
• This suppressor becomes extremely hot in normal use and will cause immediate burns. Use a
  suppressor cover or allow it to cool before handling.
• If the report, recoil, or point of impact changes noticeably during a string, stop firing and
  inspect the suppressor and mount before continuing.

• This suppressor is a firearm silencer regulated under the National Firearms Act. Possession,
  transfer, and transport must comply with all applicable federal, state, and local law.
• Transfer requires ATF approval before the suppressor may lawfully change hands. Transfer tax
  amounts and processing requirements are set by current federal law — confirm them with your dealer
  at the time of transfer.
• Only the registered owner, or a person in the registered owner’s presence and control, may
  possess the suppressor. Storing it where an unauthorized person has independent access may
  constitute constructive possession.
• Interstate transport of an NFA firearm may require prior ATF notification. Verify before you
  travel.
• Export is prohibited without proper authorization under ITAR and EAR.
• Law changes. Verify current federal and state requirements rather than relying on this
  document.

Maximum bullet diameter: 6mm / .243 (0.243″)

Before mounting, make sure the suppressor is rated for your bullet diameter and that your barrel
meets the minimum length for your cartridge.

Use the Fit Checker to confirm compatibility. Every suppressor product page at
echozuludefense.com
has one built in. Enter your cartridge and barrel length and it returns a verdict for that specific
suppressor. If the Fit Checker and this document disagree, or if anything about the result looks
off, contact us before you shoot it.

Suppressor interface: 1.375″-24 HUB

Step 1 — Prepare.

• Confirm the firearm is unloaded and the action is open.
• Inspect the host muzzle threads. They must be clean, concentric, and cut square to the bore.
• Check blast chamber clearance. Measure the depth of the suppressor’s blast
  chamber and confirm your mount or muzzle device will not contact the blast baffle. Keep a minimum
  of 0.25″ of clearance. This is primarily a concern with muzzle devices —
  direct-thread adapters rarely protrude far enough to be an issue.

Step 2 — Install.

• Apply a light film of high-temperature nickel-based anti-seize to the HUB threads.
• Hand-thread the mount fully into the suppressor, then torque to 20–25 ft-lbs,
  or to the mount manufacturer’s specification if it differs.
• Thread the suppressor onto the host by hand until seated, then torque to
  20–25 ft-lbs. Quick-detach mounts: install per the mount manufacturer’s
  instructions and confirm the locking mechanism is fully engaged.

Step 3 — Verify.

• Check alignment with an alignment rod sized for the suppressor’s caliber — a 6mm / .243 rod. Do this before the first shot
  and every time you change hosts.
• Re-check torque after the first 50 rounds on a new host, then at the start of each range session.
• A suppressor that comes loose under fire may strike. If it loosens, stop firing and work
  through it: confirm the mount and the suppressor are torqued to spec, clean the threads and
  re-apply anti-seize, re-check alignment with the guide rod, and confirm the muzzle shoulder is
  square to the bore before firing again.

• Full-auto rated: No.
• Designed for: bolt-action rifles and precision use across the 6mm-and-under range.
• Backpressure: High. The Apex will run on a semi-automatic host, but a high-backpressure can sends noticeably more gas and blowback to the shooter’s position. If your rifle has an adjustable gas block, tune it.
• High-volume strings: limit to 3–5 rounds, then allow the suppressor to cool before continuing.

• Maximum sustained wall temperature: 800°F. Ti-6Al-4V loses strength as temperature climbs, and sustained or repeated exposure above this point causes cumulative microstructural damage that is not visible from the outside.
• An IR thermometer takes the guesswork out of this.
• Allow the suppressor to cool before resuming an aggressive firing schedule.

Carbon accumulates with use and should be cleaned out periodically.

Interval: every 1,000–1,500 rounds, or sooner depending on your ammunition and firing schedule.

Preferred method — ultrasonic.

• Use Simple Green diluted 1:4 with water, or a dedicated suppressor cleaner
  (Breakthrough or similar).
• Heat the bath to the cleaner’s recommended temperature and run a 10–15 minute
  cycle.
• For heavy deposits, extend the cycle or run additional cycles rather than increasing the
  concentration.
• Protect the finish. If your ultrasonic has a wire basket, contact with it can
  damage the Cerakote. Instead, place the suppressor and the diluted cleaner in a sealed zip-top bag,
  then fill the ultrasonic tub with plain water and set the bag in the tub. The bag transmits the
  ultrasonic energy while keeping the can off the basket.
• Rinse thoroughly with clean water, blow dry with compressed air, and allow to dry completely
  before storage or use.

Alternative — soak. A 24-hour soak in the same 1:4 Simple Green solution works,
but it is less effective than ultrasonic. Rinse and dry the same way.

Threads and mount. Break the suppressor down from the mount at each cleaning
interval, wipe both thread sets clean, and re-apply high-temperature nickel-based anti-seize before
reassembly.

This is a sealed monolithic build. There is nothing inside to disassemble — cleaning is done
with the suppressor intact.

This suppressor is covered by the Echo Zulu Defense Limited Lifetime Warranty. Full terms:
echozuludefense.com/warranty-policy

The warranty covers defects in materials and workmanship. It does not cover damage from
ammunition outside the published ratings, damage from exceeding the published barrel-length or
thermal limits, unauthorized disassembly or modification, or finish wear from normal use.

Warranty and service inquiries:
rma@echozuludefense.com.
Contact us for an RMA before shipping — an NFA item shipped without prior coordination creates a
transfer problem for both of us.

• The Apex is Gen 2 of the original O’Neill Ops / SRT Arms VAPR, rebuilt through in-house DMLS printing with measurable gains over the cast original.
• It is built to a single standard: maximum suppression on a bolt gun. Backpressure is high by intent, and that is what buys the sound reduction.