Hello all,
First post here at Sniper's Hide. I run a small 07/02 FFL out of Plainfield, NH that specializes in the manufacture and development of subsonic ammunition. Our mission is to make shooting as quiet as possible and in line with that mission we've developed a little device called the PopStop. Essentially the PopStop is a device which allows for the injection of compressed CO2 into the blast chamber of a silencer. With a round chambered this CO2 injection purges the O2 out of the can and eliminates First Round Pop and First Round Flash.
Here's the genesis of PopStop:
Christmas morning 2016 and drinking coffee with my father and the topic of first round pop comes up. We discuss the various methods used to eliminate it from water to wire pulling gel and finally CO2. Thinking there's no good or safe method to efficiently displace native atmosphere in cans from chamber end or muzzle end (especially with round chambered) we came up with a little device to interface between muzzle and can that houses a high pressure valve. CO2 would be injected with a COTS bike tire inflator. Prototype gets machined out of 17-4 with 1/2-28 threads. First test is with subsonic 147gr 9mm and Walther and Gemtech Multimount. First shots were without the sound meter just to see if it would blow up. It didn't and it did appear to the naked ear to have eliminated FRP. Subsequent tests using many firearm/can combinations with the Larson Davis sound meter confirm this. The delta between dry and CO2 charged is anywhere from 2-10dB depending on the can (monocores are loudest). Ten shot averages dry compared to charged are 6-7dB quieter in .22 cans. Long story short is it works and has even held up to some light endurance testing with 147gr 7.62 through an AR-10. The commercial version is significantly lighter (1oz of machined Ti) and smaller (adds an inch to OAL) than the original 17-4 prototype.
The 5/8-24 PopStop is used with any 30 cal can. The reduction of FRP is more noticeable with the use of subsonic ammunition as the sonic crack of a suppressed supersonic 308 or 300AAC will drown out much of the perceived sound reduction at the ear. We've sound tested with both subsonic and supersonic and there is a sound reduction at each velocity. Additionally, by purging the can of its native oxygen it significantly reduces the flash associated for the first round through a suppressor. The flash reduction helps if you're night hunting with NV, or the naked eye. Also flash reduction is really important (apparently more so than sound reduction) for snipers in the dark. No flash = no target to shoot at...
How do we keep the the C02 contained? Every kit comes with two brand new unlubricated condoms to put over the can (yes, seriously). This is the most practical solution if you need to keep the gun quiet beyond 3-5 minutes, at which point the O2 starts to seep back in the can. We're currently working with a group to make a more integrated system for rifles that will ditch the handheld inflator.
Here's a link to a video of the 5/8-24 PopStop being used with our 300BLK ammunition.
The reason I'm posting here is I've been receiving questions about the efficacy of this product for snipers - specifically for the flash suppression ability. Also, I haven't done much long range testing but I suspect there may be consistency improvements by eliminating the turbulence caused by FRP.
Please PM me if you'd like to evaluate this product.
Thank you,
David Stark
Discreet Ballistics
First post here at Sniper's Hide. I run a small 07/02 FFL out of Plainfield, NH that specializes in the manufacture and development of subsonic ammunition. Our mission is to make shooting as quiet as possible and in line with that mission we've developed a little device called the PopStop. Essentially the PopStop is a device which allows for the injection of compressed CO2 into the blast chamber of a silencer. With a round chambered this CO2 injection purges the O2 out of the can and eliminates First Round Pop and First Round Flash.
Here's the genesis of PopStop:
Christmas morning 2016 and drinking coffee with my father and the topic of first round pop comes up. We discuss the various methods used to eliminate it from water to wire pulling gel and finally CO2. Thinking there's no good or safe method to efficiently displace native atmosphere in cans from chamber end or muzzle end (especially with round chambered) we came up with a little device to interface between muzzle and can that houses a high pressure valve. CO2 would be injected with a COTS bike tire inflator. Prototype gets machined out of 17-4 with 1/2-28 threads. First test is with subsonic 147gr 9mm and Walther and Gemtech Multimount. First shots were without the sound meter just to see if it would blow up. It didn't and it did appear to the naked ear to have eliminated FRP. Subsequent tests using many firearm/can combinations with the Larson Davis sound meter confirm this. The delta between dry and CO2 charged is anywhere from 2-10dB depending on the can (monocores are loudest). Ten shot averages dry compared to charged are 6-7dB quieter in .22 cans. Long story short is it works and has even held up to some light endurance testing with 147gr 7.62 through an AR-10. The commercial version is significantly lighter (1oz of machined Ti) and smaller (adds an inch to OAL) than the original 17-4 prototype.
The 5/8-24 PopStop is used with any 30 cal can. The reduction of FRP is more noticeable with the use of subsonic ammunition as the sonic crack of a suppressed supersonic 308 or 300AAC will drown out much of the perceived sound reduction at the ear. We've sound tested with both subsonic and supersonic and there is a sound reduction at each velocity. Additionally, by purging the can of its native oxygen it significantly reduces the flash associated for the first round through a suppressor. The flash reduction helps if you're night hunting with NV, or the naked eye. Also flash reduction is really important (apparently more so than sound reduction) for snipers in the dark. No flash = no target to shoot at...
How do we keep the the C02 contained? Every kit comes with two brand new unlubricated condoms to put over the can (yes, seriously). This is the most practical solution if you need to keep the gun quiet beyond 3-5 minutes, at which point the O2 starts to seep back in the can. We're currently working with a group to make a more integrated system for rifles that will ditch the handheld inflator.
Here's a link to a video of the 5/8-24 PopStop being used with our 300BLK ammunition.
The reason I'm posting here is I've been receiving questions about the efficacy of this product for snipers - specifically for the flash suppression ability. Also, I haven't done much long range testing but I suspect there may be consistency improvements by eliminating the turbulence caused by FRP.
Please PM me if you'd like to evaluate this product.
Thank you,
David Stark
Discreet Ballistics
