ANR set out to compare end-user observed differences in the NEW Sig Sauer SLH 7.62 series suppressors, versus the original SRD 7.62 Direct Thread and QD variants. This is backyard science, not official decibel reading data. We simply wanted to provide video and audio representation of the observable differences in perceived sound, surface temperature, first round pop, and gassing.
This video does not highlight the higher flow, surge style, SLX cans. Simply a comparison between the 7.62 SRD and it’s direct successor, the SLH 7.62 series. SIG has released a 300BLK SLH Ti QD suppressor, that is advertised and designed specifically for 300 BLK. ANR Design did not get the 300 BLK SLH suppressor in time for the filming of the comparison video. There will be a follow up video comparing the SLX 556 to 556 SRD cans, as well as, a video dedicated to the 300 BLK SLH Ti-QD.
Sig Sauer SLH & SLX 762 Suppressors
The Sig Sauer SLH suppressors are not the quietest, but they do their job as advertised; moving toxic gasses away from the shooter. They are a 3D Printed Inconel suppressor with a stainless steel quick disconnect adapter, the “clutch lock”. The clutch lock on the Sig Sauer SLH suppressors is the most superior QD attachment we have ever seen. It’s simplicity and ease of use trumps the Surefire and Dead Air suppressors’ quick disconnect systems. Surefire suppressors are notorious for being hard to remove, especially with lights and lasers surrounding the locking collar. Dead Air is a bit easier to remove, but nothing beats this Sig Sauer Clutch Lock.
The baffle design of the SLH cans is truly unique. We highly recommend watching the YouTube video above to see the cross section view that was published with the patent filing.
For more information about the SLH series cans, follow this link. https://www.sigsauer.com/slh-suppressor.html
The Sig Sauer SLH suppressors are heavier, more robust, and harder use than their SRD predecessor. With increased mass brings increased thermal mass. They have a much more complex baffle and chamber design. 3D printing has made unique geometry designs more prevalent in the suppressor market. More chambers means, more fins, means more heat pulled from the thermal system. The Sig Sauer SLH suppressors getting hotter and stay hotter longer.
SLH 7.62 Gassing at the Shooter
Sig Sauer SLH suppressors move gas away from the system and out the barrel more effectively than the predecessor SRD suppressors. Bolt reciprocation and unlocking creates a vacuum syringe effect to lingering gasses in the system, pulling them back towards the shooter, paired with blowback. The Sig Sauer SLH suppressors have a secondary chamber system in the baffle structure creating flow forward. They were purposely designed to force more gas away from the shooter; the downside is they are not as quiet as their SRD predecessor.
In the above photo, the gas at the shooter is minimal with a large plume being forced out the front. Compare this photo to the SRD Rattler photo below for the comparison in gas at the shooter.
Sig Sauer SRD 762 Suppressors
Sig Sauer SRD suppressors were Sig’s first suppressor line. Sig Sauer SRD suppressors were impressively quiet. They were one of the first tactical tapered mount QD suppressor lines on the market. They married perfectly to the tapered shoulders on the Sig Sauer MCX lineup of rifle systems. Tier 1 units around the globe have been photographed with LVAW, Rattler, or other MCX variants with Sig Sauer SRD suppressors. They have been the quiet staple in the SOF community for a while now. Sig Sauer SRD suppressors are a baffle/cup styled can. They have a QD locking adapter that uses the taper to create the interference to tighten the can. It’s not a great QD design. The cans do NOT come with a suppressor wrench. The baffles are much more thin, and the dwell chamber is a nozzle. This recipe gets the can super hot and has a much greater expansion coefficient than the successor. This expansion of thin walled metal sometimes causes the can to loosen on the QD mount during sustained fire. This was the biggest downfall to the cans’ design. When loose though, on a tapered shouldered barrel; there is NO chance for a baffle strike.
For more info on the Sig Sauer SRD suppressors, check out this link. https://www.sigsauer.com/srd-762-00.html
SRD 7.62 Gassing at the Shooter
The other great downfall to the SRD line is the gas at the shooter. Sig Sauer SRD suppressors are notorious for bolt speed increase and an enormous amount of gas at the shooter. Most US shooters are static shooters. The gas of the Sig Sauer SRD suppressors isn’t so bad moving and shooting. They do not create a strong photonic barrier downrange and the sound suppression is superior in the can world. Fed and Gov agencies are looking for less toxic options at the shooter, and so the surge style Sig Sauer SLH suppressors were developed. Emphasis on safety over decibel reduction.
Closing Comments on the SRD v SLH Suppressors
in conclusion, the Sig Sauer SRD suppressors are quieter, lighter weight, shorter, and create a much smaller photonic barrier down range that is easier to overcome.
Sig Sauer SLH suppressors do not increase bolt speed and are easier to tune a weapon system, harder use, force more gas away from the shooter, and have a the most superior QD system on the market.
Both Sig Sauer suppressors serve different purposes with different applications. They are both formidable in their world. ANR wishes Sig Sauer had released a SRD/Clutch lock version so both suppressors were compatible with the new QD system. If you’re looking for a placeholder for the SRD system; we recommend CGS and Dead Air suppressors.
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