What to Look for When Buying a Can: Going Quiet with SIG’s SRD9

There are a lot of options out there for 9mm suppressors, but not all of them are made equal. The SRD 9 kit from Sig Sauer is arguably the best deal going. Today we are going to take a look at why that is and what you should look for when purchasing a suppressor.

There are many reasons for people to buy suppressors. If you’ve been shooting for years or are trying to introduce someone to the shooting community, there’s no better way than a suppressed firearm. When a firearm is discharged — it’s loud. There are three sources of sound when a firearm goes boom: the muzzle blast of the high-temperature and pressure gases escaping after the bullet, the sonic crack, and mechanical noise from the firearm’s bolt or slide moving rearward. Suppressors can help to mitigate the sound from the muzzle blast by slowing propellant gases and allowing them to cool before exiting the muzzle. Sonic crack can be mitigated by using subsonic ammunition and the noise of the slide or bolt going into battery could be minimized, but it’s typically so low that people don’t bother with it.

One of the first considerations we should contemplate before purchasing a suppressor is what is it made of and why does it matter? If you’re going to go through the process paperwork and the waiting period, you want to make it worth your while. First of all, the materials SIG Sauer used in the construction of their suppressors are top notch. The shell for their SRD9 is titanium, with all stainless steel baffles. Many suppressors at this price point use aluminum after the first blast baffle, which willwears much more quickly than steel. The interior itself is made of K stacked baffles, not a monocore. A monocore baffle is a solid piece of metal that has sections machined out of it. The stacked baffle design that SIG engineered requires more machining but it helps on a few fronts.

Stacked baffles tend to be quieter, and do a much better job of dispersing heat. If you have ever owned both, you also know a monocore is more difficult to clean. All those little nooks and crannies cut in to swirl the gases around are hard to finish the job on. And last but certainly not least, stacked baffles are more forgiving if you screw up. If you manage to have a baffle strike, maybe because your can became loose during training, it’s not going to be fun to fix. No matter what, your can must be returned to the manufacturer. They can’t just send you a new baffle, as much sense as that would make. Even at the factory, having spare baffles for a serialized suppressor is a major no-no. With a monocore, you are going to be charged for an entirely new core, which is probably close to the price of your suppressor. With a stacked baffle, provided you only hit one, they only have to replace one, which is much cheaper to maintain.


  • Caliber: 9mm
  • Weight: 9 oz.
  • Diameter: 1.38 in.
  • Overall Length: 7.2 in.
  • Threads:  1/2 in. – 28 tpi
  • Attachment Type: Direct Thread
  • Material: Titanium & Stainless Steel
  • MSRP: $745
  • Manufacturer: SIG Sauer

Another thing to consider when looking at your options in cans, is what are you going to mount it to? Unfortunately, there isn’t an exact standardized attachment method and firearms come with different attachment methods. When the SRD9 kit arrived it came with everything you need in the box. Included are a 13.5×1 Left-hand piston, a 1/2×28 piston, and a fixed barrel spacer. The pistons are variously described as Neilson devices or boosters, and are a necessary piece of gear for any tilting barrel pistol. These boosters help recoil-operated firearms cycle properly by boosting the recoil energy of the barrel and slide and temporarily decreasing the effective attached weight. The 13.5 and 1/2x 28 cover the vast majority of American and European 9mm barrels. One day I am sure that will be standardized, but not today. The fixed spacer is there for carbines or any non-tilting barrel pistol. Many companies charge extra for other pistons, if they even make them. Out of the box SIG has you covered, whatever your host of choice.

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Range Time

Third, this can works. Really, really well. I don’t operate in a lab, but my ears are pretty attuned to what is too loud and what is okay. Even with supersonic ammo, the SRD 9 is comfortable to shoot. It does a fantastic job of muffling the noise and with Freedom Munitions Hush, its even better. The loudest part of the 165-grain bullets I shot during testing was the slide moving. This is exactly what you are paying for, and it delivers in spades.

Full auto rated, quiet as the grave, and bargain priced at the moment. If you are looking for a 9mm suppressor, you’d be hard-pressed to beat the SIG Sauer SRD 9.

For more information about SIG Sauer suppressors, click here.

For more information about Freedom Munitions, click here.

To go behind the scenes of SIG Sauer ammunition, click here.

To go behind the scenes of Freedom Munitions, click here.

About the author: Clay Martin is a former Marine and Green Beret, retiring out of 3rd Special Forces Group. He is a multi-decade and -service sniper, as well as 3-Gun competitor and Master ranked shooter in USPSA Production. In addition to writing about guns, he is the author of “Last Son of The War God,” a novel about shooting people that deserve it. You can also follow him on twitter, @offthe_res or his website, Off-The-Reservation.com

{ 12 comments… add one }
  • Billybob August 8, 2018, 11:32 pm

    db sound level – what is it made of ? (alum. = cheapest & dissolved by cleaning chemicals / steel will rust & heavy / stainless then titanium is best ! ) – can you take it apart to clean it ? – is it multi cal. ? – is it machine gun rated (high heat from shooting ? ) – what do you use to clean it ? –

  • Bob in NE August 8, 2018, 7:25 pm

    Clay, thank you for your service to our country. I very much appreciate what you’ve done for the U.S.

    As far as this can goes, one thing that doesn’t come through in your article and photographs is how darned big it is. I followed one of the links to the SIG website. One of their photos shows this can attached to a pistol. It’s huge! It seems like a shooter would not be able to see over the can to use the sights on the pistol. It looks more like the size of suppressor suitable for a high powered rifle than. I suspect that it would really throw off the host pistol’s balance. What kind of holster would hold this kind of rig? This SIG can seems to be very well engineered, and manufactured from quality materials, but how practical would it be to use such a rig?

  • hairyman October 14, 2017, 9:46 pm

    In Europe everything has a vat or value added tax added which is around 40%. Now if they allow shipping to the US than they may waive this, but venders have different rules so you would have to check the source your purchasing from.

  • Dan October 13, 2017, 12:47 pm

    These are made from good stuff, no junk. A short grade 5 titanium tube is EXPENSIVE.
    You can make one from a MagLight and some freeze plugs.
    It\’ll last about 500 rounds and when there\’s a baffle strike the potential ER visit will be thousands
    to patch up your left hand. You don\’t have to ask me how I know…………………
    I\’m building my own for my AAC and the PARTS were well above 300.00, zero machining.
    It will be ALL titanium and individual stainless K baffles. Buy once, cry once.

  • Jay October 10, 2017, 4:40 pm

    A Can? Of corn, carrots, green beans, spinach, pea, potatoes, ya lots of cans but too many choices! Just had to do it!!!

  • Larry October 9, 2017, 4:14 pm

    This suppressor would be a great match for SIG’s MPX Carbine unfortunately SIG decided to pin and weld the flash suppressor to the barrel.

  • Paul Zoba October 9, 2017, 2:02 pm

    I think legalizing suppressors will drive more development and testing leading to better cans for much less money. What was that carbine he was shooting?

  • Joseph October 9, 2017, 10:55 am

    “I don’t operate in a lab, but my ears are pretty attuned to what is too loud and what is okay.” Download a free dB meter for your smart phone. Give us a break! “I know better” fan-boy nonsense has no place in responsible journalism, which this isn’t.

  • joefoam October 9, 2017, 9:18 am

    How much do suppressors sell for in Europe where they are not so heavily regulated?

  • akjc77 October 9, 2017, 8:57 am

    I agree thats a ridiculous price and this article is being way too optimistic that the hearing act will even go through now after that horrific mess that went down in Las Vegas (which we will likely never get truth about) but ole she-devil Hillary jumped all over the hearing act within hours of the disaster. By the way I have just had a feeling them binary trigger groups and bump stocks may bite us in the butt.

  • Jim October 9, 2017, 8:30 am

    “Bargain priced at the moment”?? At $745? Hardly. It’s a great can, but let’s be real and cut the advertorial, Clay.

  • Tommygun851 October 9, 2017, 6:47 am

    $745 MSRP !? I’ve never understood why something that is only a metal cylinder that has some simple stamped parts and springs in it, costs as much as a high quality firearm! Is it that when someone invests a $200 fee and 6 months to a year of time, that that person needs to feel that the item has a high enough value as to balance off the high investment costs ? On an item that realistically should only cost less than a hundred dollars! Well, hand it to the suppressor manufactures to give the consumer what he wants! Mark my words , when the suppressor tax is dropped, you will see them selling for a fraction of the price!

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