Silencer Review: SIG SAUER MODX-9 Modular 9mm Suppressor

Modular silencers have become increasingly popular, and for good reason. They provide “the best of both worlds” in that the user can choose between shorter, lighter, and louder or longer, heavier, and quieter. SIG SAUER’s new MODX-9 also gives you everything in-between, with each and every one of its six baffles being optional.

To get a better feel for the MODX-9, hit play on the video above or click HERE to view it on Rumble. If the MODX-9 (or any other silencer, for that matter) seems like your jam, make sure to visit Silencer Shop for great prices and the simplest suppressor-buying experience possible.

There she is, the SIG SAUER MODX-9 in all her glory, with all of the baffles and front cap installed. All-in it weighs 9.7 ounces and is 7.5 inches long.

One baffle down! Front cap re-installed. Each DMLS 3D printed titanium baffle weighs 0.65 ounces. For reference, the front cap weighs 0.95 ounces…

…and the booster assembly (seen above with two baffles added to it) weighs 4.9 ounces.

Two baffles down! Each baffle and the front cap add 0.75 inches to the MODX-9’s overall length.

Yes, I took photos of every possible length:

That’s a pretty cool front cap! It also acts as a baffle, with a simpler version of a baffle cone inside of it. Above the front cap the piston can be seen inside of the serialized mount section.

Out on the range, the MODX-9 was super quiet in its full length configuration. More or less as quiet as a 9mm silencer gets. A little bit of first round pop was noticeable, but not bad.

Even with all of the baffles in use, the MODX-9’s sub-ten-ounce weight didn’t destroy the balance of my little P365 with True Precision threaded barrel. I noticed no blowback or gas to the face.

Shortened up — and I did most of my testing with three baffles plus the front cap (so one more than in the photo above) — I was more impressed with the MODX-9’s performance. Compared to the four or five other 9mm cans I’ve run at that approximate length, it was definitely on the quiet end of the spectrum and had a particularly low, nice tone to it.

Unless I was trying to impress friends with movie-like pew pew hush, I think I’d run it most of the time in that three baffles plus front cap configuration. The balance of sound suppression and light weight while reducing mass out in front of the muzzle seemed just about perfect when configured like this.

To adjust the length of the modular suppressor, SIG includes two simple spanner wrenches in the box. These index into the slick, modern looking grid pattern printed into the MODX-9 so the user can loosen or tighten the baffles as needed.

And, to be clear, it almost certainly will be needed. Snugging up the baffles by hand is easy enough and they only need to be gently tightened, but after some shooting or if you go a little overboard on the tightening you’re going to need the extra leverage.

Did I mention they made the front cap look really cool? Not that I’d suggest staring at this end of it unless you’ve removed it from your pistol. Obviously.

Speaking of pistols, I forgot to take a photo of this setup because I was having so much fun in my really cool sun hat for dads, but I also shot the MODX-9 on a little pistol caliber carbine (PCC) as a fixed barrel spacer is included in the box. In sounded great.

And, actually, that’s a CMMG Banshee 300 upper receiver on a machine gun lower. SIG doesn’t specifically say whether the MODX-9 is full-auto rated or not, but considering its titanium construction and the 9mm host I wasn’t worried about it. And it did fine, of course (granted, I’m going easy on ammo these days).

The SIG SAUER MODX-9 will obviously be compared to the Q ERECT9R, an extremely similar-in-design suppressor that I reviewed just a few months ago. The ERECT9R has a couple more baffles and, in full config, is 1.2 inches longer for it. However, as all but the serialized blast baffle are aluminum, the Q is 1.6 ounces lighter than the SIG.

My take: they perform equally. The retail price is within about five bucks of each other, though the SIG comes with more accessories. I prefer the look of the ERECT9R’s booster housing (it’s shorter and the same diameter as the rest of the suppressor). Aside from that aesthetic preference in Q’s favor, if I were making a buying decision I’d lean toward the MODX-9 due to its titanium construction. Ultimately it’ll outlast the aluminum can and hold up to more vigorous cleaning methods. For me, the Ti durability is worth the 1.6-ounce weight penalty.

Whether you’re looking for maximum stealth or minimum size and weight, or something in-between, the SIG SAUER MODX-9 provides incredible modularity with modern manufacturing techniques, cool looks, and really solid performance.

For more info on the SIG MODX-9, visit SIG SAUER and Silencer Shop.

Specifications: SIG SAUER MODX-9 Modular 9mm Suppressor

Caliber: 9mm
Length: 7.5 inches in full configuration. Each baffle and the front cap accounts for 0.75 inches of length.
Weight: 9.7 ounces in full configuration with booster. Each baffle weighs 0.65 ounces, the front cap weighs 0.95 ounces, and the booster assembly with serialized mount weighs 4.9 ounces.
Diameter: 1.35 inches
Materials: DMLS 3D printed titanium with stainless steel mount components
Finish: black DLC
Mount: 1/2×28 piston, 13.5×1 LH piston, fixed barrel spacer, and two boosters springs all included
MSRP: $925 (much less via Silencer Shop!)

Ratings (out of five stars):

Overall  * * * * 1/2
Short pistol suppressors look and feel good. Long pistol suppressors sound good. The SIG MODX-9 refuses to lock the owner into a one-or-the-other situation, providing the utmost in modularity with its individually-removable 3D printed titanium baffles. The MODX-9 is a very strong performer and is, without doubt, an extremely good 9mm pistol suppressor choice that I would recommend without hesitation.