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Old August 13th, 2014, 09:37 AM #1
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Anyone seen OSS Suppressors? Looks like a great option for rifle suppression.

I was out at Free State this weekend, and was talking to them about suppressors in general.

They said that they had a newer company called OSS come out last week with their roadshow truck, and apparently Free State is going to be a dealer for them now. These are a completely clean sheet design from "traditional" suppressors, and at first look it really appears to me that these guys are doing a lot of stuff "right" as far as their designs go. Of course, I don't actually know that much about suppressors, so I figure'd I'd post here.

The highlights:
This is a three piece system.
1. FHMB, or Flash Hider / Muzzle break. You get of these per weapon, specific to that caliber.
2. BPR, or Back Pressure Regulator. You get one of these, and it can mount over ANY caliber FHMB. This mounts "backward" with the body of it going back over the barrel and only adds .63" OAL to the weapon beyond the tip of the FHMB. The BPR alone will drop a .556 round to 148dB if it's cold.
3. SRM, or Signature Reduction Module. This attaches to the front of the BPR and adds another 4" of OAL. With the entire system in place, it will drop a .556 round to 138dB cold.

If you buy all three components as a set, the only part which is serialized for NFA purposes is the BPR.

The system doesn't use traditional baffles at all. Instead, it used a stacked series of internal turbine vanes to cause the expanding gas to travel something like 44 linear inches before it exits the front of the device. This has the added (and huge, IMO) benefit of reducing the amount of extra bolt velocity you get (on an AR). With the OSS system, they claim that you only end up with 6% higher bolt velocities instead of the 25% - 60% with traditional suppressors. This means that you also don't wind up with blowback in your face and an overgassed weapon.

They claim a minimum 10,500 round life before any degredation of performance at low cyclic rates (20 RPM), with a minimum of 4,500 rounds before any performance decrease at 850RPM. And when performance does begin to degrade, you only replace part of the FHMB, which is about $40, since there are no traditional internal baffles to degrade.

Basically, you can buy one "system" consisting of an FHMB, a BPR, and an SRM. You pay one tax stamp on it. Later, if you want to put it on another caliber (say, moving from 5.56 to 7.62) you need only buy another FHMB (which are about $350) for the other weapon. No new tax stamp, and you just move the rest of the components over.

Free State has some nice literature on these, as well as a couple of demo unit cutaways so that you can see how the internals work. The OSS website is also good:

http://www.oss-online.com/the-system-2.html

And I found a couple of youtube videos on them as well:

https://www.youtube.com/watch?v=tE6uro6oH3w

https://www.youtube.com/watch?v=0oXMrvDU7-Q

These just seem like a really nice solution to suppressing a rifle to me. What does everybody else think?
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Old August 13th, 2014, 10:59 AM #2
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Interesting but a bit pricey at $1,600 for a complete setup. They also measure the db reduction using a different method than other manufactures so it makes suppression reduction hard to compare.
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Old August 13th, 2014, 11:39 AM #3
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Yeah, definitely not the cheapest thing around, but does seem like a good, robust system. I *really* like the fact that the only real wear part is $40 and five minutes to replace.

As far as the dB reduction, I was wondering about that too. From what they said in the videos, it appears that their method is actually more stringent than the traditional way of doing it - at the shooter's ear, and inside a small enclosed space. Granted though, I know absolutely nothing about measuring sound in that manner.
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Old August 13th, 2014, 11:47 AM #4
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I was at Freestate when they were testing the suppressor and will be ordering one as soon as I can. I can only compare it to my SDN6 and the OSS is much quieter.
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Old August 13th, 2014, 11:52 AM #5
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Interesting....will have to read more when I get home. I was leaning towards the AAC SDN6

Last edited by Speed3; August 13th, 2014 at 02:36 PM.
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Old August 13th, 2014, 12:16 PM #6
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Quote:
Originally Posted by pwoolford View Post
I was at Freestate when they were testing the suppressor and will be ordering one as soon as I can. I can only compare it to my SDN6 and the OSS is much quieter.
Jealous. Wish I could have been there for that.

Also, FWIW HK is using these to build the MR556A1-SD and MR762A1-SD.
http://www.hk-usa.com/military_produ...sd_general.asp
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Old August 13th, 2014, 07:21 PM #7
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Just reviewed looks awesome! Free state has some of these in stock?
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Old August 13th, 2014, 10:27 PM #8
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I don't think they have any in stock right now, but they have the dealer materials including some cutaway dummy ones so you can see how the system looks and assembles.
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Old August 14th, 2014, 09:20 AM #9
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I will wait until a few people get them and put a large number of rounds through them.

A lot of money and a LOT of time, for a new product.
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Old August 14th, 2014, 09:57 AM #10
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oh look, it's full of acronyms. that'll help with fooling people that they have some sort of government contract or something.

seems ridiculous to me. pass.
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