In our continuing coverage of SIG Sauer Suppressors, this week we busted out the big bore. The SRD45, for that most American of cartridges, the .45 ACP. Most people assume that .45 is the perfect suppressed round since most of its loadings are already subsonic. That briefs well, but so far has not been my experience.
In the past, I have found .45 to be the worst of the handguns to suppress, at least as far as noise goes. I am not an engineer, so I can’t tell you why. Maybe it has had to do with the massive bore diameter combined with relatively low pressure. For whatever reason, every .45 suppressor I’ve shot forced me to grab my earplugs. Until now.
- Caliber: .45 Auto
- Weight: 12 oz.
- Diameter: 1.38 in.
- Overall Length: 7.9 in.
- Threads: 1/2 in. – 28 tpi
- Attachment Type: Direct Thread
- Material: Titanium & Stainless Steel
- MSRP: $745
- Manufacturer: SIG Sauer
SIG has done some amazing things with suppressor technology over the last year, and the handguns have not been left out. The SRD 45 features all the same goodness as the SRD9 we reviewed here, scaled up to a man’s round. The baffle design is different, but most of the internal design is the same, including construction materials. From our SRD9 review:
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.
The SRD 45 comes with both metric and English pistons, in .578 in x28tpi and M16x1mm LH respectively. It also includes a spacer to use in place of the pistons if you are lucky enough to own a .45 ACP carbine. The best part of the SRD45? Just by purchasing extra pistons, you can use the same can on your 9mm and .40 S&W pistols.
Why Pick .45?
This .45 suppressor actually works, it makes .45 ACP hearing safe. Excellent!
Step One — Now why would you choose .45? The .45 caliber is to pistols what .300 AAC Blackout is to rifles. When you look at suppressed choices, you are by nature of the challenge already limited by velocity. That is, for a truly quiet round, you must already be in the subsonic range of speed. When velocity has a threshold, in my opinion, you might as well shoot the heaviest bullet you can. The heaviest 9mm bullet I have ever seen is 165 grains. For .45 ACP, the standard is 230 grains. Questions?
For a host, I chose to go with the Smith & Wesson M&P 45. This is an excellent platform, complete with a factory threaded barrel if you choose the right options package. The 10+1 capacity is a great to have with this caliber, and the Smith handles it nicely!
Article Continues Below.
For ammunition, I turned to Freedom Munitions. Not only was the regular re-manufactured .45 ACP reliable, it was hearing safe. But the true champion of the day was the 45 HUSH. Last year, Freedom Munitions spent some R&D time working on HUSH, a line of ammunition design specifically for suppressed weapons. Not only is it quieter, it features a powder designed to burn better in guns with mufflers. The 45 HUSH was definitely the fuel of choice.
The SRD45 has left me impressed, and that is getting harder to do these days. If you are in the market for a handgun suppressor, this one covers all of your needs.
To learn more about Freedom Munitions, click here.
For more information about SIG Sauer suppressors, click here.
To purchase a SIG Sauer suppressor on GunsAmerica, click here.