URG-I + Surefire 300SPS = Hollywood pew pew quiet

Not expecting it to be so quiet! Compared to several other 14.5, 16 and 20” rifles it was by far the quietest and I’m not sure I fully understand why. Using M193 and M855 was pew pew. I thought I was running subsonics for a minute…

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Originally Posted by ryanm

Not expecting it to be so quiet! Compared to several other 14.5, 16 and 20” rifles it was by far the quietest and I’m not sure I fully understand why. Using M193 and M855 was pew pew. I thought I was running subsonics for a minute…

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Maybe quiet to the ear because it is overbore with less back pressure?

They must have gas system tuned perfectly with the 300SPS. I will take a video next time side by side with a few others. I don’t have a db meter but it is very noticeable difference.


Sent from my iPhone using Tapatalk

If you have a smart phone, you can download a noise meter app. These apps are not very accurate but will give a rough measure of the noise level difference.

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Originally Posted by TMS951

Maybe quiet to the ear because it is overbore with less back pressure?

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Could be. There's no quieting the Supersonic Crack.

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Originally Posted by markm

Could be. There's no quieting the Supersonic Crack.

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That is the big sticking point for rifle cans. They may be "more" quiet than without a can, but that sound barrier is an ugly beast to beat.


If I'm shooting out in the open I might use a can, but under a roof, trees, cliffs, or anything else, that noise gets pretty amplified. Hearing protection is still a must.

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Originally Posted by ryanm

Not expecting it to be so quiet! Compared to several other 14.5, 16 and 20” rifles it was by far the quietest and I’m not sure I fully understand why. Using M193 and M855 was pew pew. I thought I was running subsonics for a minute…

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Shoot a video if you can, I would love to see what sort of differences you are hearing.

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Originally Posted by markm

Could be. There's no quieting the Supersonic Crack.

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You’re absolutely right of course. But Surefire advertises that the 300 SPS is their quietest suppressor and was designed primarily for that purpose, so they must have changed some things around. I’m sure part of the reason it’s so quiet is because it’s longer than many of their other suppressors, but they keep their cards close to their vest when discussing their own technologies.

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Originally Posted by Javon

You’re absolutely right of course. But Surefire advertises that the 300 SPS is their quietest suppressor and was designed primarily for that purpose, so they must have changed some things around. I’m sure part of the reason it’s so quiet is because it’s longer than many of their other suppressors, but they keep their cards close to their vest when discussing their own technologies.

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What? SureFire's been pretty open about how the 300 SPS is much quieter than the SOCOM, they use totally different baffle designs; the 300 SPS trades acoustic attenuation for backpressure.

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Originally Posted by Defaultmp3

What? SureFire's been pretty open about how the 300 SPS is much quieter than the SOCOM, they use totally different baffle designs; the 300 SPS trades acoustic attenuation for backpressure.

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Did you read what I said? I said Surefire advertises that it’s their quietest suppressor.