Short, Titanium Hard-Use & Precision Rifle Suppressor
The DOMINUS-K-SR is the "Short" (Kurz) version of the DOMINUS-SR. At 5.45 inches long and 10.0 ounces, it is 1.5 inches shorter and 2.5 ounces lighter than the full size DOMINUS-SR. When mounted, it adds only 4.87" to the barrel overall length.
The DOMINUS-K-SR is our super short, hard-use/full-auto 5.56 and .30
caliber suppressor. It delivers five principal design goals:
1. full-auto durability;
2. light-weight titanium construction;
3. best-in-class repeatability, accuracy, and retention;
4. suppression level similar to Ultra series; and
5. extremely short length added to weapons systems.
It is a true light-weight micro-sized "Go To War" suppressor and is perfect for 5.56 assault rifles and .30 caliber battle rifles, including SBR variants. It retains the accuracy and repeatability TBAC is known for. It's equally at home on a 0.25 MOA bolt rifle on the 1500-yard range as it is on a MK18 in the CQB house.
The DOMINUS-K-SR meters at 145 dB (milspec left/right) and 134 dB at shooters-ear1 on a 20-inch .308 bolt-action rifle. This is roughly 4 dB quieter than the ULTRA 5 for the muzzle measurement.
On 10.3-inch "Mk18" AR-15 SBR (without any special tuning) shooting Mk318 5.56 ammunition, it meters at 145 dB muzzle (milspec left/right) and 144 dB at the shooter's ear. Note that this is the same as the shooter's ear dB for the full-size DOMINUS-SR for an untuned upper, which means that the shooter is experiencing primarily noise from the action as opposed to noise from the muzzle report.
These are numbers from our PULSE system which should be considered definitive, supplanting all data from the older 2209 sound-level meters.
The DOMINUS-K-SR features our "SR" quick-attach/detach mount to provide Secondary Retention, retention during hard-use and heat cycles, and precision-rifle-level accuracy.
The DOMINUS-K-SR is rated for what we call a "Hard-Use/Full-Auto" (HU/FA) firing schedule. We specify this as surviving at least 10 cycles of the SOCOM/SURG firing schedule. The SR mount keeps the suppressor tight throughout each cycle and is a key feature in enabling this rating. After 10 SOCOM/SURG cycles, a test unit metered 1 dB louder than a brand new unit. The SR mount still functions and is easily removed at the end of the series of cycles (see video on the right-hand column).
The SR mount uses a novel paw and cam-path system to ensure that "full lock up" can happen in either of the two adjacent detent slots for any given final shouldering position of the suppressor on the conical brake shoulder. This categorically avoids the "off by one" problem that many "clicky" mounts have. The SR mount has the exact same accuracy, repeatability, and return-to-zero characteristics that all our precision suppressors are known for.
This mounting system is covered by US Patent 9,791,234.
The following are the DOMINUS-SR Q&A's, which also apply to the K-SR version.
How can Titanium be full-auto rated?
Titanium is tough. Most of of the material data on titanium is obtained by heating up the material and applying a static load. While that data is helpful, a suppressor sees very different stress/load characteristics. Over the last three years, we've developed our own material data experimentally and used that to design a very light but strong, full-auto rated titanium suppressor. This process involved testing many titanium prototype suppressors to failure.
SOCOM requires a suppressor to survive six cycles of the eight-magazine firing schedule (the SOCOM/SURG schedule). This suppressor is guaranteed to survive 10. For reference, the 17-4 steel muzzle brake must be replaced every four cycles.
This is .30 cal -- where's the .223/5.56mm version?
Short answer: The .30 cal version is the 5.56 version.
The DOMINUS-SR, in its native .30 caliber, was designed to have minimal blowback on 5.56 semi-auto and full-auto rifles. We put a lot of effort into minimizing the blowback without giving up sound suppression performance.
I already have an Ultra 9/7/5, will the DOMINUS-SR fit on my CB brake mounts?
No, the DOMINUS-SR will only fit on the TBAC SR series mounts. We do have the DOMINUS-CB version that fits the CB series mounts. Once built an SR version cannot be changed to a CB version.
How does baffle erosion affect sound suppression?
After 10 cycles of the SOCOM/SURG firing schedule, we metered a test suppressor and it was 1 dB louder than when it was brand new.
A SOCOM/SURG cycle is 240 rounds. Does this mean the can's lifetime is only 2400 rounds?
No! A SOCOM/SURG cycle represents something even worse than the "worst case" firing schedule that SOCOM expects MK18's or M4's to need to withstand. If you don't get the suppressor to the heat-soaked state of the SOCOM/SURG cycle (which happens around magazine 4-5 during each test cycle), the incremental "wear and tear" of each round, for example just firing semi-auto, on the suppressor is dramatically less. Basically, if you don't do a heat/load cycle that meets the SOCOM/SURG test, it doesn't really count towards the suppressor's "lifetime."
All these firing schedules are for 5.56-- what about .30 caliber?
Our testing and analysis has shown that the SOCOM/SURG test in 5.56 is harder on the suppressor than a similar test using 12.5-inch .308's. The analogous .30 caliber firing schedule from SOCOM is 6, 20-round magazines and this does not provide heat input close to the 5.56 test protocol.
Will the SR brake make a 14.5" barrel reach 16"?
Yes, SR brakes will bring a 14.5" barrel to 16" and they can easily be pinned.
How much overall length does the DOMINUS-SR add to the barrel?
The DOMINUS-SR adds approx 6.370" to the overall length of the barrel when its brake is mounted to threads that meet the thread spec standard.
Why isn't this suppressor "Modular"?
We design a suppressor for a specific purpose and the entire design is optimized to best accomplish that goal. This is the first light-weight precision rifle suppressors that is also a hard-use/full-auto suppressor. Adding modularity might make it "seem" like the suppressor is more adaptable but it actually becomes a hindrance to the primary design goals. Forcing modularity often requires a compromise to things like: repeatability, weight, or strength. Most modular or adaptable suppressors do "Okay" at a variety of applications but aren't "GREAT" at any of them. We design our suppressors to be "The Best" at what they're designed for.
What service does the SR mount require?
Please refer to the Operator-level SR Series Instructions.
Why is the CB version of this suppressor not full-auto rated? Isn't it the same suppressor
as this one, just with a different mount?
The CB version is mostly the same as the SR version, except the rear end is different. Thus the strength of the suppressor itself is the same, but without the retention and locking capabilities of the SR mount, the CB mount does not retain the "Full Auto" rating. Other than that, the minimum barrel length ratings will be the same.
If the DOMINUS-SR is still grade 5 titanium like the ULTRA series, why doesn't the ULTRA series have the same hard-use rating?
The DOMINUS-SR was designed and tested for this specific use and has structural differences compared to the ULTRA series. In addition, the SR mount will keep the suppressor tight during the full-auto parts of the firing schedule, which cannot be guaranteed with the CB mount.
Why doesn't this look like other "tubeless" cans? What's the deal with tubeless?
Conventional centerfire rifle suppressors are typically built with a tube, a baffle stack that includes the thread or mount-end, and a front endcap. The "right way" to build a suppressor like this is to fully weld the entire baffle stack together, insert it into the tube, and then weld it together again. When done properly, both the baffle stack and the tube contribute to the pressure rating of the suppressor. A "tubeless" design is simply one in which the baffles are welded together and all the finishing operations are done to the outside of the resulting suppressor body, and no tube is placed over the welded baffle stack. When both designs are done properly and to the same strength rating, the tubeless design enjoys a very slight weight advantage; but it's mainly a lot "cleaner" to manufacture, with few operations that can warp the suppressor or leave it with residual stresses. Many people consider a "tubeless" design to be more advanced than "tubed" designs; but really, the end-user shouldn't care how it's built because you can build a great suppressor either way, and there are some good reasons to stick with tubed designs.
My SR collar isn't straight/square/aligned when I tighten it, is it broken?
No. The collar is not intended to stay perfectly parallel/square to the body when locked. The play is there on purpose for clearance so foreign material does not compromise functionality of the locking mechanism.
Minimum barrel lengths:
|5.5"||.300 Blackout (subsonic and full power)|
|7.5"||6.8 SPC, 7.62x39|
|10.3"||223 Rem, 5.56, 6.5 Grendel|
|12.5"||.308 Win, .260 Rem, 6.5 Creedmoor|
|18"||6.5 SAUM, 6.5 PRC, 7mm RM, 7mm WSM, .300 WIN MAG, .300 WSM|
|20"||7mm RUM, .300 RUM|
|22"||.300 Norma Magnum, 28 Nosler, 7 STW, 26 Nosler|
Note on dB ratings
We now specify the dB rating as a single number due to the long-term consistency of the B&K PULSE system. These should be considered the "reference" numbers compared to anything published previously -- please see our youtube videos.
|Maximum rated caliber||.30 caliber, up to .300 RUM
|Diameter||1.85-inch OD (collar)
|Mounts||SR series brake (full spec)
|Brake threads available||1/2-28, 5/8-24, 9/16-24, 3/4-24, 3/4-28, M18x1.0, M18x1.5
|Finish||Black CeraKote; OD Green or FDE available|
|Brake Material||Heat-treated 17-4 stainless|
|Brake Finish||Ionbond DLC|
|Use||Hard-Use/Full-Auto & Precision/Long-range|
|Warranty||TBAC Limited Lifetime Warranty|
|How to order a suppressor|
There is general confusion as to what firing schedules different suppressors on the market can actually withstand. We've seen "full auto"-rated suppressors that will fall apart after a few mags of full auto, and on the other hand, there are some "precision rifle suppressors" that will actually withstand a lot of abuse.
We rate our suppressors conservatively and try to be as accurate as possible in our description of what use they can withstand "forever" or for their defined service life. To this end, we have defined the following firing-schedule categories for our centerfire rifle suppressors.
Lifetime to exceed at least 10 SURGE cycles on a 10.5" M4 / MK18.
One SOCOM/SURGE CYCLE comprises
Mag 1: 1 round/second
Mag 2: 2 rounds/second
Mag 3: 1 round/second
Mag 4: 3-5 round burst
Mag 5: 1 round/second
Mag 6: 2 rounds/second
Mag 7: 1 round/second
Mag 8: 1 continuous burst
Outlined in Section 3.6.1.i. in Solicitation H92222-17-R-0011
The basis for this is the SOCOM/SURGE specification, which is a common heavy firing schedule specified in many military solicitations. One SURGE cycle is 8 magazines fired in this pattern, with magazine changes happening as quickly as possible. After a full 8-magazine cycle, the suppressor and firearm is allowed to cool to ambient. This firing schedule significantly exceeds the worst-case application of assault rifles and baffle rifles. A milspec M4 needs service and inspection after each cycle to keep operating.
Most common 17-4 steel muzzle brakes will be eroded significantly or have critical surfaces destroyed after 2-4 SURGE cycles. How often has your firing schedule destroyed your muzzle brake? If the answer is never, you haven't even exceeded half of what this suppressor can take.
Suppressors in this category will still have minimum barrel length ratings for most cartridges.
The SR muzzle brake will have a replacement schedule if fired "to the letter" of this schedule. It is recommended that the SR brake be replaced when visible deformation of the brake ports happens, or the suppressor simply won't fit over the brake anymore.
NOTE: The collar is not intended to stay perfectly parallel/square to the body when locked. The play is there on purpose for clearance so foreign material does not compromise functionality of the locking mechanism.
Why does the muzzle-brake require replacement?
The SR series muzzle brake requires replacement every four (4) cycles of the SOCOM/SURG cycle. During full auto fire, the pressure and heat input to whatever the muzzle blast hits "first" does a lot of material damage. Even though 17-4 stainless is one of the hardest and most durable brake materials, even it will be damaged on critical surfaces with enough SOCOM/SURG cycles. If you are not firing full SOCOM/SURG cycles (and nobody actually does this in real life), you should examine the brake for brake port erosion or deflection and replace as needed.
Reference image: SR brake after 15,000 rounds of .308
Reference image: SR brake after 4 SOCOM/SURG cycles