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The STI Six is what happens when CGS takes their battle-proven SCI-Six platform and builds it out of DMLS 3D-printed titanium instead of Inconel. The result is a 6.5-inch can that weighs a feathery 9.3 ounces bare, or 11.3 ounces with the included flash hider mount installed. That is a serious weight savings on the end of your barrel, and anyone who has run a heavy can on a lightweight carbine knows how much difference a few ounces at the muzzle makes in handling.
This suppressor was built around the 5.56x45mm cartridge from the ground up, and it also handles .223 Rem and 6 ARC without complaint. There are no barrel length restrictions, so it is right at home on short-barreled builds where blast and flash are at their worst. The internal design vents gas forward and outward to lower-pressure regions of the can, which cuts down on the gas blowing back into your face and keeps the action running cleaner. Less backpressure, less flash, less noise, and a rifle that stays smoother through long range sessions.
Because the body is grown as a monolithic structure through additive manufacturing, there are no welds to warp or fail and no concentricity issues stacking up along the length of the can. CGS also treats their titanium cores for added strength and hardness, and the internals are coated so carbon fouling has a hard time sticking in the first place.
Attachment is handled by the included quick-detach flash hider mount with 1/2×28 threads, which adds 1.125 inches to the system and gives you fast, repeatable installation with a taper-style lockup. Thread the mount on your favorite host, and swapping the can between rifles takes seconds. For a lightweight, hard-use 5.56 can with real pedigree behind it, the STI Six is tough to beat.
They share the same core design and 6.5-inch footprint, but the SCI-Six is built from Inconel 718 while the STI Six body is DMLS 3D-printed titanium. That drops the bare weight from around 17 ounces down to just 9.3 ounces. If muzzle-heavy handling bugs you, the titanium version is the one to grab.
No, CGS rates it for use on 5.56 hosts with no barrel length restrictions. That makes it a great fit for short-barreled carbines and pistols where flash and blast are the biggest headaches. It is intended for both semiautomatic and automatic host weapons.
It ships with a quick-detach flash hider mount threaded 1/2×28, which adds 1.125 inches to the system length. Pick up extra mounts for your other 5.56 rifles and you can move the can between hosts in seconds with repeatable alignment.
CGS lists it as compatible with .223 Rem, 5.56 NATO, and 6 ARC platforms. The bore and internal volume were designed around the 5.56 cartridge, so it performs at its best there, but 6 ARC hosts are fully supported. Stick with quality factory ammo for the best sound performance.
| UPC | 850002123548 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | CGSSTISIX |
| ATF Type | Silencer |
| Caliber/Gauge | .223 REM/5.56 NATO |
| Product Type | NFA – Silencer |
| Shipping Weight | 1.0 |
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