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-aLNxDYxc
The ROC556K is built around a very high flow rate achieved by SIEGE’s patented Linear Diffuser Array, which pushes gases, unburnt powder, and other particulate matter forward through a sequence of flow cells so they exit cleanly at the muzzle. That high flow rate keeps gas-operated rifles cycling naturally with less tuning required and directs contaminants downrange instead of back into the action or the shooter’s face. The result is consistent, quiet shooting with no cleaning or disassembly needed, and every ROC556K is bonded into a single monolithic structure for exceptional strength, erosion resistance, and long service life.
SPECS:
Caliber: 5.56mm / 6mm
Length w/ STRONGHOLD adapter: 5.68"
Length w/o mount: 5.18"
Diameter: 1.5”
Weight w/ STRONGHOLD adapter: 14.68oz
Weight w/o adapter: 12.78oz
Materials: Precipitation Hardening SS & Inconel Linear Diffuser Array
Finish: Nitride
Full Auto Rated
No Barrel Length Restrictions
WHATS IN THE BOX:
ROC556K Suppressor
2 - Siege Spanner wrenches
Siege STRONGHOLD HUB Adapter & DEFENDER 2 Port Brake 1/2x28 - Plan B Compatible
5.56mm vented removable endcap
1 reviews for ROC556K - Includes: STRONGHOLD HUB Adapter & DEFENDER 2 Port Muzzle Brake
Wyatt
Jul 06, 2025Ive come to the full conclusion as a very early adopter of the ROC556K that this thing is just flat out filled full of black magic. It feels LESS gassy than unsuppressed, sounds amazing considering its a K-can. Gives me everything I hoped for and more. Makes shooting so much nicer and pleasant. -Quality fit and finish -Looks SUPER SWEET -Good weight and with mount and hub balances out my 16" AR-15 very well. -Mount and hub are very well built -Nothing on this thing is going to get stuck on your rifle or leave you in a pickle, every part from the suppressor/muzzle device/hub with the included wrenches has points to grab onto and leverage. -The endcap is probably one of the coolest in the industry and isnt all for show. It very clearly does a LOT to help gas flow through and keep it away from the chamber. All in all if youre looking for a short can that has great performance, low profile, and extremely low back pressure this is probably what would fit perfectly. They really left no stone un-turned and thought of every single aspect of this during design. I cant find anything Id change or any design flaws. It feels like an extremely premium product down to even the impressively designed packaging. I wasnt paid to post this, I bought this with my own money and waited like everyone else. I didnt receive any non-public discounts either.
