SILENCER SATURDAY #213: Blizzard! SIG Sauer SLH Suppressor Preview

    Good evening everyone and welcome back to TFB’s Silencer Saturday brought to you by Yankee Hill Machine, manufacturers of the YHM R9 suppressor. Last week we got a look at suppressors from the 2022 SHOT Show. This week we get a preview of the new SIG Sauer SLH suppressor line up. I know, I still owe you the LMT ION 30 review, and I’d love to get these SIG cans in front of the MCX, but COVID (thanks a lot SHOT Show) and an active blizzard are keeping me indoors. As much as I love you guys, I’m staying inside where it’s warm and dry.

    A reminder to participate in the TFB Suppressor Survey:

    SIG Suppressors & Rifles:

    SILENCER SATURDAY #213: Blizzard! SIG Sauer SLH Suppressor Preview

    The latest generation of suppressors from SIG have some big shoes to fill. The SRD line, specifically the SRD762QD-TI model is one of the best performing subsonic 300BLK cans ever made (my opinion). Coincidentally, one Silencer Saturday reader, Nick, reached out last week and asked about the SLX and SLH sound performance – I promise, these two just showed up yesterday.

    The SL line of suppressors from SIG aren’t exactly new – we’ve shot them at a few events, inspected them at prior SHOT Shows, and they are even out in the wild in limited numbers. But for whatever reason, the SIG SLX and SLH silencers are still hard to come by.

    The current supply levels could be a result of a few different factors. The ongoing NGSW contract competition includes a suppressor requirement and SIG’s entry includes the SIG SLX68-MG-QD model. Manufacturing could be tilted towards the machinegun suppressor as we get closer to the award date.

    Because the SLH and SLX models are manufactured using a non-standard technique called direct metal laser sintering (additive manufacturing or 3D printing), the process is more advanced, yet slower than bulk machined parts. Basically each suppressor is “grown” over a period of hours or days in machines that can turn out 20-40 pieces at a time. The benefits are increased strength and the ability to create internal geometries not possible with rotational-style manufacturing. The downside is that it requires special machines and takes longer to make.

    The low in-the-wild numbers could mean the supply chain crunch for raw materials is effecting the suppressor industry just like everyone else. If you are in the market, be patient and keep checking Silencer Shop and other dealers/distributors for updates.

    In contrast with the SLX models, the SLH models feature a “multi-flow path” that dramatically reduces blowback of gasses and noise from the ejection port. Instead, pressure is relieved inside the suppressor by allowing gas flow to vent forward and out around the muzzle.

    Let’s take a look at the details.


    SIG SAUER is proud to introduce the new SLX and SLH series of suppressors. Both the SLX and SLH were developed to meet the demands of the U.S. military, and are designed to deliver cutting-edge performance.

    The SLH series of rifle suppressors also features the new Clutch-LOK QD mounting system, and an internal multi-flow path with a focus on sound reduction, while also reducing up to 50% of the toxic fumes venting through the ejection port. The SLH is ideal for users that use both supersonic and subsonic ammunition, and are optimized for sound reduction.

    SIG Sauer SLH and SLX Models:

    All SLX and SLH models currently on the SIG Sauer site:

    SILENCER SATURDAY #213: Blizzard! SIG Sauer SLH Suppressor Preview

    SILENCER SATURDAY #213: Blizzard! SIG Sauer SLH Suppressor Preview

    SILENCER SATURDAY #213: Blizzard! SIG Sauer SLH Suppressor Preview

    SILENCER SATURDAY #213: Blizzard! SIG Sauer SLH Suppressor Preview

    SIG Sauer SLH Suppressors – TFB Review

    Here are the two SIG SLH suppressors in for testing.

    • Model: SLH300TI-QD
    • MSRP: TBD
    • Caliber: 300 Blk
    • Material:  Titanium
    • Diameter: 1.67 in (42 mm)
    • Length: 8.8 in (224 mm)
    • Weight: 1.0 lbs (16 oz)
    • Mounting System: Clutch-Lok QD
    • Model: SLH762-QD
    • MSRP: TBD
    • Caliber: 7.62 NATO
    • Material: Inconel
    • Diameter: 1.67 in (42 mm)
    • Length: 7.49 in (190 mm)
    • Weight: 1.32 lbs (21.1 oz)
    • Mounting System: Clutch-Lok QD

    User Manual:

    The digital version of the user manual isn’t available yet, so let’s take a look at the analog version.

    Here is some basic nomenclature and feature identification. I like all the wrench flat options, even if those are more handy on direct thread models.

    SILENCER SATURDAY #213: Blizzard! SIG Sauer SLH Suppressor Preview

    SILENCER SATURDAY #213: Blizzard! SIG Sauer SLH Suppressor Preview

    The Clutch-Lok QD system is simple and seems very effective. A short 1/16 turn changes the mount from unlocked to locked after screwing on the suppressor. The mount and muzzle device use tapered surfaces to make a tight seal.

    SILENCER SATURDAY #213: Blizzard! SIG Sauer SLH Suppressor Preview

    SILENCER SATURDAY #213: Blizzard! SIG Sauer SLH Suppressor Preview

    The direct thread versions come with a wrench that can be used to torque the suppressor on to about 15-20 ft-lbs.

    SILENCER SATURDAY #213: Blizzard! SIG Sauer SLH Suppressor Preview

    SILENCER SATURDAY #213: Blizzard! SIG Sauer SLH Suppressor Preview

    Clutch-Lok QD mount

    Like the SIG suppressor muzzle devices before it, the Clutch-Lok QD mounts come in two parts. The base that has the suppressor threads and the taper surface and either a brake or flash hider top end. The two pieces are combined using a crush washer that is used to time the brake correctly. This system is a little more complex than standard mounts, but ensures a solid mount without the use of multiple spacers to tone the whole muzzle brake.

    Manufacturer’s Page: https://www.sigsauer.com/clutch-lok-shouldered-qd-muzzle-brake-for-slx-slh-suppressors-7-62mm.html 

    • MSRP: $157.99
    • Overall Length: 2.2 inches
    • Threads: 5/8 in – 24 tp
    • Weight: 3.3 oz
    • Material: Stainless Steel
    • Technology: Clutch-Lok QD
    • Type: Muzzle Brake
    • Barrel Interface: 90-degree shoulder (25 degree taper model available)
    • Caliber: 7.62 NATO

    Wrapping Up:

    I’m excited to get these two SIG cans out for some comparison testing. Hopefully I get it the range plowed this week and get some time on the 6.75” and 9” SIG MCX rifles – my favorite 300BLK platform.

    Be safe, have fun and we’ll see you back next weekend for another Silencer Saturday.

    SILENCER SATURDAY #213: Blizzard! SIG Sauer SLH Suppressor Preview

    SILENCER SATURDAY #213: Blizzard! SIG Sauer SLH Suppressor Preview

    SILENCER SATURDAY #213: Blizzard! SIG Sauer SLH Suppressor Preview

    SILENCER SATURDAY #213: Blizzard! SIG Sauer SLH Suppressor Preview

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    DEALERS: If you want your link to buy YHM suppressors included in future Silencer Saturday posts, email: [email protected]

    Pete

    Editor In Chief- TFB
    LE – Silencers – Science
    [email protected]


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