In Stock and Ready to ShipFeatures:Thread Pitch: 1/2x28 or 5/8x24 Mounting Interface: Q Plan-B / 1.375x24 “HUB” compatible Adds 1.5" to overall barrel length – ideal for pin & weld setups Material: 17-4 PH stainless steel Finish: Black nitride Made in Oregon Backed by our Lifetime Warranty This 2-port brake delivers serious recoil control while offering a direct-mount interface for Q Plan-B style suppressors and other HUB-compatible systems. Whether you're running suppressed or not, the Defender keeps your AR flat and fast. Perfect for converting 14.5" barrels to 16" legal OAL with pin & weld. 

In Stock and Ready to ShipFeatures:Thread Pitch: 1/2x28 or 5/8x24 Mounting Interface: Q Plan-B / 1.375x24 “HUB” compatible Adds 1.5" to overall barrel length – ideal for pin & weld setups Material: 17-4 PH stainless steel Finish: Black nitride Made in Oregon Backed by our Lifetime Warranty This 2-port brake delivers serious recoil control while offering a direct-mount interface for Q Plan-B style suppressors and other HUB-compatible systems. Whether you're running suppressed or not, the Defender keeps your AR flat and fast. Perfect for converting 14.5" barrels to 16" legal OAL with pin & weld.

In Stock and Ready to ShipFeatures:Thread Pitch: 1/2x28 or 5/8x24 Mounting Interface: Q Plan-B / 1.375x24 “HUB” compatible Material: 17-4 PH stainless steel Finish: Black nitride Made in Oregon Backed by our Lifetime Warranty The Havoc flash hider is built for shooters who want maximum flash suppression with suppressor-ready mounting. Its open 4-prong design disperses muzzle flash while remaining compatible with Plan-B and other HUB-thread suppressors. Designed for durability and precision in real-world conditions.

In Stock and Ready to ShipFeatures:Thread Pitch: 1/2x28 or 5/8x24 Mounting Interface: Q Plan-B / 1.375x24 “HUB” compatible Material: 17-4 PH stainless steel Finish: Black nitride Made in Oregon Backed by our Lifetime Warranty The Havoc flash hider is built for shooters who want maximum flash suppression with suppressor-ready mounting. Its open 4-prong design disperses muzzle flash while remaining compatible with Plan-B and other HUB-thread suppressors. Designed for durability and precision in real-world conditions.

Due to the demand and dedication we put into every order, please allow 4-6 weeks for SIEGE to ship your suppressor. We promise it will be worth the wait!This is an NFA item and it must be transferred to your preferred FFL & SOT.  Please email the FFL & SOT you would like to use for transfer along with your order number to: info@siegesuppressors.com ABOUT THE ROC556K:The ROC556K by Siege Suppressors uses Linear Diffuser Array technology.Video -  What happens inside of the Linear Diffuser Array?  https://www.youtube.com/watch?v=II-aLNxDYxcThe linear diffuser array is engineered to redirect propellant gasses radially through an arrangement of turbulent and laminar flow cells. Each series of cells flows into the next until propellant, lead, copper, and carbon are expelled at the exit. The internal geometries greatly reduce the potential for long-term build-up or fouling. It is by design, self-cleaningThe same design mechanism that promotes the free flow of gasses from cell to cell also diminishes back pressure significantly.  The large surface area and the unique diffuser geometries effectively reduce the sound and flash signature without the excessive blowback experienced with more common designs.Reducing excess back pressure removes a major cause of over-pressure-induced failures and maintains the host weapon's inherent reliability. An added benefit of a low back pressure design is an improved shooter experience with less gas presented to the shooter’s face when using AR and bullpup-type weapons. Siege Suppressors also offer extreme durability and erosion resistance due to the design of the diffuser array, monolithic structure, and contiguous bore.  Siege suppressors are designed to use a contiguous bore within the linear diffuser array, different from any other suppressor.  The contiguous bore is a design feature that offers increased erosion resistance compared to conventional designs due to the flow characteristics of propellant gasses and unburned gunpowder through the suppressor. Because there are no angular features and no baffles used in the internal construction of the suppressor, the propellant gasses and unburned gunpowder have no angular barriers to react against and therefore erode over time.  In a Siege Suppressor, propellant gasses and unburnt gunpowder travel around the diffuser array, down the contiguous bore, and out of the muzzle end of the suppressor. The unique flow of gasses within a Siege Suppressor provides a suppressor that is less prone to internal erosion from propellant gasses and unburnt gunpowder when compared to traditional baffled suppressor designs.SPECS:Caliber: 5.56mmLength w/ DT Adapter: 5.43"Length w/o mount: 5.18"Diameter: 1.5”Weight w/ DT adapter: 14.55 ozWeight w/o adapter: 12.78 ozMaterials: Precipitation Hardening SS & Inconel Linear Diffuser ArrayFinish: NitrideFull Auto RatedNo Barrel Length RestrictionsWHATS IN THE BOX:ROC556K Suppressor2 - Siege Spanner wrenchesSiege OMNIHEX Direct Thread Mount5.56mm vented removable endcap

Due to the demand and dedication we put into every order, please allow 4-6 weeks for SIEGE to ship your suppressor. We promise it will be worth the wait!This is an NFA item and it must be transferred to your preferred FFL & SOT.  Please email the FFL & SOT you would like to use for transfer along with your order number to: info@siegesuppressors.com ABOUT THE ROC556K:The ROC556K by Siege Suppressors uses Linear Diffuser Array technology.Video -  What happens inside of the Linear Diffuser Array?  https://www.youtube.com/watch?v=II-aLNxDYxcThe linear diffuser array is engineered to redirect propellant gasses radially through an arrangement of turbulent and laminar flow cells. Each series of cells flows into the next until propellant, lead, copper, and carbon are expelled at the exit. The internal geometries greatly reduce the potential for long-term build-up or fouling. It is by design, self-cleaningThe same design mechanism that promotes the free flow of gasses from cell to cell also diminishes back pressure significantly.  The large surface area and the unique diffuser geometries effectively reduce the sound and flash signature without the excessive blowback experienced with more common designs.Reducing excess back pressure removes a major cause of over-pressure-induced failures and maintains the host weapon's inherent reliability. An added benefit of a low back pressure design is an improved shooter experience with less gas presented to the shooter’s face when using AR and bullpup-type weapons. Siege Suppressors also offer extreme durability and erosion resistance due to the design of the diffuser array, monolithic structure, and contiguous bore.  Siege suppressors are designed to use a contiguous bore within the linear diffuser array, different from any other suppressor.  The contiguous bore is a design feature that offers increased erosion resistance compared to conventional designs due to the flow characteristics of propellant gasses and unburned gunpowder through the suppressor. Because there are no angular features and no baffles used in the internal construction of the suppressor, the propellant gasses and unburned gunpowder have no angular barriers to react against and therefore erode over time.  In a Siege Suppressor, propellant gasses and unburnt gunpowder travel around the diffuser array, down the contiguous bore, and out of the muzzle end of the suppressor. The unique flow of gasses within a Siege Suppressor provides a suppressor that is less prone to internal erosion from propellant gasses and unburnt gunpowder when compared to traditional baffled suppressor designs.SPECS:Caliber: 5.56mmLength w/ STRONGHOLD adapter: 5.68"Length w/o mount: 5.18"Diameter: 1.5”Weight w/ STRONGHOLD adapter: 14.68ozWeight w/o adapter: 12.78ozMaterials: Precipitation Hardening SS & Inconel Linear Diffuser ArrayFinish: NitrideFull Auto RatedNo Barrel Length RestrictionsWHATS IN THE BOX:ROC556K Suppressor2 - Siege Spanner wrenchesSiege STRONGHOLD HUB Adapter & DEFENDER 2 Port Brake 1/2x28 - Plan B Compatible5.56mm vented removable endcap

Due to the demand and dedication we put into every order, please allow 4-6 weeks for SIEGE to ship your suppressor. We promise it will be worth the wait!This is an NFA item and it must be transferred to your preferred FFL & SOT.  Please email the FFL & SOT you would like to use for transfer along with your order number to: info@siegesuppressors.com ABOUT THE ROC556L:The ROC556L by Siege Suppressors uses Linear Diffuser Array technology.Video -  What happens inside of the Linear Diffuser Array?  https://www.youtube.com/watch?v=II-aLNxDYxcThe linear diffuser array is engineered to redirect propellant gasses radially through an arrangement of turbulent and laminar flow cells. Each series of cells flows into the next until propellant, lead, copper, and carbon are expelled at the exit. The internal geometries greatly reduce the potential for long-term build-up or fouling. It is by design, self-cleaningThe same design mechanism that promotes the free flow of gasses from cell to cell also diminishes back pressure significantly.  The large surface area and the unique diffuser geometries effectively reduce the sound and flash signature without the excessive blowback experienced with more common designs.Reducing excess back pressure removes a major cause of over-pressure-induced failures and maintains the host weapon's inherent reliability. An added benefit of a low back pressure design is an improved shooter experience with less gas presented to the shooter’s face when using AR and bullpup-type weapons. Siege Suppressors also offer extreme durability and erosion resistance due to the design of the diffuser array, monolithic structure, and contiguous bore.  Siege suppressors are designed to use a contiguous bore within the linear diffuser array, different from any other suppressor.  The contiguous bore is a design feature that offers increased erosion resistance compared to conventional designs due to the flow characteristics of propellant gasses and unburned gunpowder through the suppressor. Because there are no angular features and no baffles used in the internal construction of the suppressor, the propellant gasses and unburned gunpowder have no angular barriers to react against and therefore erode over time.  In a Siege Suppressor, propellant gasses and unburnt gunpowder travel around the diffuser array, down the contiguous bore, and out of the muzzle end of the suppressor. The unique flow of gasses within a Siege Suppressor provides a suppressor that is less prone to internal erosion from propellant gasses and unburnt gunpowder when compared to traditional baffled suppressor designs.SPECS:Caliber: 5.56mmLength: 7.70”Length w/o mount: 7.45"Diameter: 1.5”Weight: 18.06 ozMaterials: Precipitation Hardening SS & Inconel Linear Diffuser ArrayFinish: NitrideFull Auto RatedNo Barrel Length RestrictionsWHATS IN THE BOX:ROC556L Suppressor2 - Siege Spanner wrenchesSiege OMNIHEX Direct Thread Mount5.56mm vented removable endcap

Due to the demand and dedication we put into every order, please allow 4-6 weeks for SIEGE to ship your suppressor. We promise it will be worth the wait!This is an NFA item and it must be transferred to your preferred FFL & SOT.  Please email the FFL & SOT you would like to use for transfer along with your order number to: info@siegesuppressors.com ABOUT THE ROC556L:The ROC556L by Siege Suppressors uses Linear Diffuser Array technology.Video -  What happens inside of the Linear Diffuser Array?  https://www.youtube.com/watch?v=II-aLNxDYxcThe linear diffuser array is engineered to redirect propellant gasses radially through an arrangement of turbulent and laminar flow cells. Each series of cells flows into the next until propellant, lead, copper, and carbon are expelled at the exit. The internal geometries greatly reduce the potential for long-term build-up or fouling. It is by design, self-cleaningThe same design mechanism that promotes the free flow of gasses from cell to cell also diminishes back pressure significantly.  The large surface area and the unique diffuser geometries effectively reduce the sound and flash signature without the excessive blowback experienced with more common designs.Reducing excess back pressure removes a major cause of over-pressure-induced failures and maintains the host weapon's inherent reliability. An added benefit of a low back pressure design is an improved shooter experience with less gas presented to the shooter’s face when using AR and bullpup-type weapons. Siege Suppressors also offer extreme durability and erosion resistance due to the design of the diffuser array, monolithic structure, and contiguous bore.  Siege suppressors are designed to use a contiguous bore within the linear diffuser array, different from any other suppressor.  The contiguous bore is a design feature that offers increased erosion resistance compared to conventional designs due to the flow characteristics of propellant gasses and unburned gunpowder through the suppressor. Because there are no angular features and no baffles used in the internal construction of the suppressor, the propellant gasses and unburned gunpowder have no angular barriers to react against and therefore erode over time.  In a Siege Suppressor, propellant gasses and unburnt gunpowder travel around the diffuser array, down the contiguous bore, and out of the muzzle end of the suppressor. The unique flow of gasses within a Siege Suppressor provides a suppressor that is less prone to internal erosion from propellant gasses and unburnt gunpowder when compared to traditional baffled suppressor designs.SPECS:Caliber: 5.56mmLength: 7.95”Length w/o mount: 7.45"Diameter: 1.5”Weight: 19.96 ozMaterials: Precipitation Hardening SS & Inconel Linear Diffuser ArrayFinish: NitrideFull Auto RatedNo Barrel Length RestrictionsWHATS IN THE BOX:ROC556L Suppressor2 - Siege Spanner wrenchesSiege STRONGHOLD HUB Adapter & DEFENDER 2 Port Brake 1/2x28 - Plan B Compatible5.56mm closed removable endcap

In Stock and Ready to ShipFeatures:Converts suppressors with 1.375x24 “HUB” threads to Q Plan-B 1.1875x24 internal threads Material: 17-4 PH stainless steel Finish: Black nitride Precision machined to match Siege tolerances Made in Oregon Backed by our Lifetime Warranty The Stronghold adapter allows you to run Plan-B threaded muzzle devices on any suppressor with a HUB-style (1.375x24) rear thread. Built to exact tolerances, it's the ideal solution for cross-platform suppressor setups.