Irregular Design Group Hesychia SIXK Suppressor

6mm / 5.56 · Hesion Bow Mount · 1/2x28 Hybrid Flash Hider · Monolithic Inconel 718 · Extreme Low Backpressure · Full-Auto Rated · FDE High Temp Cerakote · NFA The Irregular Design Group (IDG) Hesychia SIXK is a monolithic Inconel 718 suppressor for 6mm and 5.56 calibers built around the Hesion Bow dual-locking mount system. This listing includes the 1/2x28 Hybrid Flash Hider bundle. High Temp FDE Cerakote finish. Laser Powder Bed Fusion (LPBF) construction enables complex internal geometry—radial diamond initial chamber, early annular intakes, captured helix paths, shielded ports, and monolithic flexure pawls—all printed as a single sealed unit with critical interfaces machined afterward. No user-serviceable internal components. 15.5 oz. 5.72" OAL. Full-auto rated for 10.3" barrels and above. No host tuning required.

Hesion Bow Dual-Locking Mount

Primary lock is a 15-degree taper over 0.25" of length combined with a 1-1/8"-8 left-hand American Buttress Thread—15 ft./lbs. of torque generates over 1,700 lbs. of sealing force. Less than 2.5 rotations to full taper lock. Six flexure pawls printed into the suppressor body engage 32 grooves on the outer edge of the muzzle device as a secondary redundant retention system. Adds only 0.5 oz. to the overall system weight.

1/2x28 Hybrid Flash Hider — Included

Hybrid Flash Hider (HFH) on 1/2x28 threads included with this bundle. The HFH is the appropriate muzzle device for hosts that will spend meaningful time both suppressed and unsuppressed—provides stronger unsuppressed flash management and better host behavior when the suppressor is removed compared to Flow Enhancer options.

Extreme Low Backpressure Gas Management

Gas enters a radial diamond structure in the initial chamber, gets disrupted and cooled, then routes into annular pathways before reaching the first blast baffle. Immediate pressure distribution across the suppressor rather than a pressure event at the blast baffle. Host cycling behavior stays closer to the unsuppressed baseline without requiring adjustable gas blocks, heavier buffers, or spring changes.

Monolithic Inconel 718 — LPBF Construction

Inconel 718 provides dimensional stability, erosion resistance, and thermal cycling durability under hard use with 6mm ARC and 5.56. LPBF enables internal geometry—annular intakes, helix paths, shielded ports, and integral pawls—that cannot be produced through conventional machining. Blast baffle zone receives dedicated hardening treatment. Fully sealed monolithic unit—no baffles to remove, no user-serviceable internals.

Full-Auto Rated / No Host Tuning Required

Full-auto rated for 10.3" barrels and above. Minimum recommended barrel length is 10.3" for 5.56 and 6mm. Designed to mount and function without host modification on any compatible firearm.

Installation Notes

Install HFH to barrel at 30 ft./lbs.—timing not required, threadlocker not normally required. Cycle the mount 5–7 times on a new system during break-in. A slight rear gap when mounted confirms proper taper seating. Always use an alignment rod before first firing. Clean taper and mating surfaces before each mount.

FDE High Temp Cerakote

High Temp FDE Cerakote applied over monolithic Inconel 718 body.

Specifications:

• Manufacturer: Irregular Design Group (IDG)
• Model: Hesychia SIXK
• Caliber: 6mm / 5.56
• Material: Inconel 718
• Manufacturing: Laser Powder Bed Fusion (LPBF)
• Construction: Monolithic (Sealed)
• Mount: Hesion Bow (15-Degree Taper + 1-1/8"-8 LH American Buttress Thread)
• Secondary Lock: Integral Flexure Pawls (6) / 32-Groove Muzzle Device
• Muzzle Device Included: Hybrid Flash Hider, 1/2x28
• Gas Profile: Extreme Low Backpressure
• Overall Length: 5.72 inches
• Weight: 15.5 oz
• Full-Auto Rated: Yes (10.3" barrel minimum)
• Minimum Barrel Length: 10.3 inches
• Finish: FDE High Temp Cerakote