SIG Sauer
SIG SLX556-QD Suppressor
SIG's flagship 5.56 NATO flow-through suppressor, the factory-aligned can for the MCX Spear LT and 5.56 platforms
Quick Specs
- Price
- $1,550
- Weight
- 1 lb 3.2 oz
- Brand
- SIG Sauer
- Category
- suppressor
Features
- •5.56 NATO rated
- •Inconel construction
- •Flow-through baffles
- •Clutch-LOK QD mount
Capability Boosts
Recommended For
Compatibility Tags
Overview
The SIG SLX556-QD is SIG's 5.56 NATO flow-through suppressor for compatible Clutch-Lok muzzle-device hosts, including many SIG rifle setups. The SLX line was designed around two specific problems traditional baffle 5.56 cans create on short-barrel rifles: blowback through the ejection port and increased gas-driven action speed.
The internal multi-flow-path baffle design vents gas forward through the muzzle rather than back through the action. Construction is Inconel, which is chosen for heat and erosion resistance on hard-use rifle hosts. The trade-off is weight: around 19.2 oz, the SLX556-QD is heavier than many compact 5.56 cans.
Mounting is via the SIG Clutch-Lok QD system, which is a meaningful integration advantage on hosts already wearing compatible SIG SL-pattern muzzle devices. On other hosts, plan the muzzle-device ecosystem before buying.
The MSRP is $1,549.99. The SLX556C-QD is a shorter sibling for shooters who prioritize length over absolute sound reduction.
Key Features
- Multi-flow-path baffle design vents gas forward
- Low-tox design reduces blowback vs traditional baffles
- Inconel construction for heat and erosion resistance
- SIG Clutch-Lok QD mount integrates with compatible SIG muzzle devices
- 5.56 NATO rated, supersonic capable
- Compatible with full-auto sustained fire
Pros
- +Lower blowback than many traditional baffle 5.56 cans
- +Clutch-Lok QD mounts directly on compatible SIG SL muzzle devices
- +Inconel construction is built for hard-use 5.56 hosts
- +Factory SIG product integrates with MCX, MPX, and broader SIG ecosystem
- +Reduces bolt-carrier velocity vs traditional baffle cans
Cons
- −Heavy at about 19.2 oz
- −$1,549.99 MSRP puts it in the premium 5.56 category
- −Inconel construction adds weight forward of the muzzle, affecting balance
- −QD mount is SIG-proprietary, less universal than 1.375x24 ASR alternatives
Detailed Specifications
- Length
- 7.4 inches
- diameter
- 1.67 inches
- weight
- 19.2 oz
- Material
- Inconel
- Mount Type
- SIG Clutch-LOK QD (1/2x28 host thread)
- ratedCalibers
- 5.56 NATO
- fullAutoRated
- Yes
- msrp
- $1,549.99
- warranty
- Lifetime
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Add the SIG SLX556-QD Suppressor to your build and see how it enhances your platform.