Description
FX556K-SS
The FX 556K-SS is a compact, 17-4 stainless steel suppressor designed for applications where every inch matters, like short-barreled rifles (SBRs). Despite its smaller size, it delivers exceptional sound suppression and is versatile enough to handle both 5.56mm and 6mm cartridges (6mm cm, 6ARC, 6×47, 243 etc.), thanks to its slightly oversized bore. Rated for responsible full-auto use with a cooldown period after 100 rounds, the FX 556K-SS combines durability, performance, and a reduced footprint for shooters who need a reliable, compact suppressor.
Caliber: 5.56 (6mm bore)
Material: Heat Treaded 17-4 Stainless Steel
Construction: Precision machined, Laser welded
Weight: 11.5oz
Length: 5.8
Diameter: 1.61″
Full auto rated: Yes, Responsibly. After 100 rds it will need a cool down period
Mount: Hub compatible, This Suppressor comes with a 1/2×28 direct thread mount
For aftermarket mount options the maximum depth is 2” from the from the rear face of the suppressor to the blast baffle.
Barrel Restrictions: 223/5.56 10.5″/FA, 6mm (arc,cm,br,.243) 12″




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