Made via DMLS, or direct metal laser sintering, the Radical Firearms Sinter suppressor is made from ~2,600 layers of sintered titanium to become one perfectly monolithic finished unit. The Sinter is a .30 caliber silencer rated for everything .300 WinMag on down, including full-auto use.
At an MSRP of $899 — less at Silencer Shop, which of course makes the suppressor buying experience as easy as legally possible — the Sinter comes with both a 5/8×24 and a 1/2×28 muzzle device.
Sort of a hybrid compensator, brake, flash hider, these muzzle devices feature a taper in front of the threads, which seals up against a matching taper inside the Sinter. This sort of tapered mating surface increases surface area over square shoulders, provides a little “squeeze” between the two parts, and reduces the chance of the suppressor coming loose during use.
By putting the taper in front of the threads, the threads are kept clean and clear of carbon buildup.
It takes just five full rotations to take the Sinter from removed to fully snug. It’s not as quick as some QD systems, but it’s faster and easier (due to the self-indexing and the course threads) than a direct thread silencer.
The DMLS process leaves a unique texture, as the individual layers of material are visible if you look closely. It’s especially visible anywhere with an angle (on the Sinter, that’s in the muzzle end, which is seen in a photo to follow).
In the case of the Radical Firearms Sinter titanium suppressor, a honeycomb pattern was designed into the 1.75-inch exterior diameter. Not only does it provide solid grip for installing and removing the Sinter, it increases surface area to aid in cooling.
Aside from creating a truly monolithic end product that typically has a more uniform grain structure than even a forged piece, the biggest advantage to DMLS manufacturing is the ability to create structures that could never be machined.
In the case of a suppressor this means internal gas pathways and complicated structures that would either be impossible to machine or cast or prohibitively expensive and complicated to make and/or assemble.
For the Sinter, this means four channels that vent gas and pressure directly from the blast chamber out the front of the suppressor. One of those channels is visible at approximately 7:30 in the photo above — it looks like a rectangular bar that runs longitudinally. What you can’t see if that it’s hollow and there’s a small port just inside the wall of the Sinter.
On the business end, the four small ports at the end of the internal tubes are clearly visible.
According to Radical Firearms, which tested the Sinter with and without these ports and with varying sizes and numbers of ports, this configuration significantly reduced backpressure and provided more sound reduction than without the ports. That’s another benefit of DMLS: it’s extremely easy to print a dozen prototypes, all of them slightly different from one another.
Out on the range I tested the Sinter on a 10-inch .308 Pork Sword Pistol, and it did great. Radical says the Sinter measures at 136.7 dB off to the side of the muzzle on a 12.5-inch .308, so at the shooter’s ear we should be “hearing safe” even on this 10-inch configuration.
Indeed, it was comfortable to the ears and came very close to matching the sound level of some of the nicest, best-performing suppressors on the market that I’ve shot on this same configuration.
Shooting subsonic .308, which is effectively identical to subsonic 300 Blackout, the Sinter was super quiet. The first and second rounds were a little louder, and then once the oxygen was purged from the suppressor it sounded like scarcely more than a loud pellet gun.
Over to a standard hunting rifle-length 6.5 Creedmoor, in this case Savage’s new Impulse straight pull, the Sinter sounded really great. It has a solid, low tone to it and tames the fairly loud 6.5 Creedmoor extremely well.
This sounds and feels totally comfortable for a day on the range — very much like simply taking your ear protection off of you and putting it on the gun.
At one pound of weight dead on, the Sinter’s mass is noticeable at the end of a 20-inch barrel but it isn’t cumbersome. For a titanium .30 cal suppressor in 2021 it’s a bit porky, but across all full-size .30 cal suppressors it would be considered lighter than the norm.
Thanks to the included 1/2×28 muzzle device I was able to quickly and easily move the Sinter over to an AR-15 chambered in 5.56. Thanks to the Sinter’s full-auto rating I was able to dump a magazine (or two) of .223 through it without breaking any rules.
On the AR I found the Sinter about as quiet and comfortable as any suppressor gets, with most of the annoying noise of shooting the gun coming from the action and gas system, not so much out the muzzle.
Looking at the video there appears to be slightly more gas coming out the ejection port than when the gun is unsuppressed, but only slightly. On the range I didn’t notice a difference. I do believe that port system, stripping gas and pressure directly from the blast chamber, has a meaningful effect on reducing backpressure (and Radical Firearms even developed a scientific testing system in-house to prove and quantify this).
Radical Firearms, located in the Houston, TX metro area, is working hard to bring advanced technology and high-end manufacturing in-house. I’ve seen them expand significantly over the past couple of years and continue to be impressed with the progress they’re making to put out increasingly high quality components and implement advanced process control and QC.
Keep an eye on these guys, because they’re going to become an increasingly legitimate player in the quality end of the market. The Sinter is a good example of modern technologies and solid design that we can expect to see.
Specifications: Radical Firearms Sinter-762
Caliber: .30 Caliber (up to .300 WM)
Length: 8.0 inches
Weight: 16 ounces
Diameter: 1.75 inches
Materials: titanium (Ti-6Al-4v)
Finish: Cerakote C Series high-temp
Mount: one 5/8×24″ and one 1/2×28″ muzzle device
MSRP: $899 (less via Silencer Shop!)
Ratings (out of five stars):
Overall * * * *
Radical Firearm’s Sinter is an extremely strong performer and a very useful .30 cal suppressor with its generous cartridge and firing scheduling ratings and muzzle devices threaded for different guns. It’s a really great silencer. I’d give it five stars if it were 10 ounces instead of 16, but then again that may sacrifice durability and reduce the acceptable firing schedule. As an all-around suppressor to use on everything in your stable .30 cal and smaller, it’s a great choice.