Irregular Design Group Hesychia 556UK-HUB 5.56 HUB 1.375-24 Inconel 718 Magpul FDE Suppressor

Irregular Design Group Hesychia 556UK-HUB Suppressor5.56 NATO Dedicated A HUB 1.375-24 TPI A Monolithic Inconel 718 A Low Backpressure A Full-Auto Rated A 11 oz A 4.18" A Magpul FDE High Temp Cerakote A NFA STAFF NOTE: UPC not confirmed for Magpul FDE variant - verify before publishing. The Irregular Design Group (IDG) Hesychia 556UK-HUB is the HUB-mount version of the Hesychia 556UK-a dedicated 5.56 ultra-compact monolithic Inconel 718 suppressor on a 1.375-24 TPI HUB interface. Laser Powder Bed Fusion (LPBF) construction with radial diamond initial chamber, early annular intakes, captured helix paths, shielded ports, and complex exterior texture in a sealed monolithic unit with critical interfaces machined afterward. High Temp Cerakote Magpul FDE. 11 oz. 4.18" OAL. 1.75" diameter. 2.8" between blast baffle and front face. 1.34" chamber depth. 136 dB at ear, 140 dB at muzzle (MD dependent). Full-auto rated for 10.3" barrels and above. Note on HUB packaging tradeoffs: The HUB threaded region consumes internal volume that in the native 556UK is used for gas pockets and disruption geometry. The 556UK-HUB maintains the same gas management philosophy but differs in internal volume and efficiency from the native Hesion Bow version. For maximum performance margin in this family, the Hesychia SIXK is the better option.HUB 1.375-24 TPI InterfaceHUB 1.375-24 TPI mount for cross-compatibility with HUB-threaded muzzle devices and adapters. Threadlocker for the HUB adapter to the suppressor is highly encouraged. Always use an alignment rod before first firing. IDG is not liable for improper use of third-party mounting systems resulting in damage.Low Backpressure Gas ManagementGas 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 keeps host cycling behavior closer to the unsuppressed baseline. No adjustable gas blocks, heavier buffers, or spring changes required.Flash ControlDeep recessed exit aperture with six exit ports pulls gas from the central core where mixing is highest. Isolated annular pockets at the nose vary flow rate and encourage gas to exit at an angle away from the bore path-reduces crack associated with K-sized 5.56 suppressors.Monolithic Inconel 718 - LPBF ConstructionInconel 718 provides dimensional stability, erosion resistance, and thermal cycling durability under hard 5.56 use. LPBF enables early annular intakes, helix paths, shielded ports, and complex interior geometry in a single sealed unit. No removable baffle stack, no user-serviceable internals.4.18" Ultra-Compact / Full-Auto Rated4.18" OAL at 11 oz. 1.75" diameter. 1.34" chamber depth. Full-auto rated for 10.3" barrels and above. Minimum recommended barrel length is 10.3"-shorter barrels increase blast baffle erosion and raise projectile stability risk.Installation NotesInstall to muzzle device manufacturer's specification. Threadlocker on HUB adapter to suppressor highly encouraged. Always use alignment rod before first firing. IDG is not liable for improper use of third-party mounting systems resulting in damage.Magpul FDE High Temp CerakoteHigh Temp Cerakote in Magpul FDE applied over monolithic Inconel 718 body.NFA ItemNFA-regulated item. Requires completion of NFA tax stamp process and transfer through licensed Class III FFL dealer. The IDG Hesychia 556UK-HUB delivers ultra-compact dedicated 5.56 HUB suppressor performance-monolithic Inconel 718 at 4.18" and 11 oz with low backpressure gas management in Magpul FDE.Specifications:Manufacturer: Irregular Design Group (IDG)Model: Hesychia 556UK-HUBCaliber: 5.56 NATO (Dedicated)Material: Inconel 718Manufacturing: Laser Powder Bed Fusion (LPBF)Construction: Monolithic (Sealed)Mount: HUB 1.375-24 TPIGas Profile: Low BackpressureOverall Length: 4.18 inchesDiameter: 1.75 inchesChamber Depth: 1.34 inchesBaffle-to-Front Distance: 2.8 inchesWeight: 11 ozdB at Ear: 136 dB (MD Dependent)dB at Muzzle: 140 dB (MD Dependent)Test Platform: DD MK18 10.3"Full-Auto Rated: Yes (10.3" barrel minimum)Minimum Barrel Length: 10.3 inchesHost Tuning Required: NoFinish: High Temp Cerakote Magpul FDE