first round pop question

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greyling22

greyling22

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The question: in a .22 can that has a first round pop, how often does the pop occur? only the first time of the day? every magazine? every time you use the can with a gap of _____ minutes between firings?

The backstory: First off, I am not a suppressor expert at all, and my hearing is not super great.
But, I"m looking for my first can, a 22 can. I got to test fire a couple of .22 cans at the local dealer yesterday. spectre II, sparrow, and the new surefire can. All with cci minimags, surefire and sparrow were brand new, the spectre had had about 300rds through it since it was last in the sonic cleaner, and only 3 rounds with each out of the walther p22.
The surefire can was significantly louder than the other 2 cans. All 3 rounds sounded about as loud as the first round pop on the sparrow. The sparrow had a fairly loud first round pop, but the rest were fairly quiet. The spectre ii didn't really have a FRP, and every round sounded about the same. So as far as sounds go, the spectre ii wins. But it is a little larger and needs more frequent cleanings than the sparrow. Too bad they don't make the sparrow with the performance of the spectre.
 
I have a SS Sparrow. FRP seems to stay away for maybe 3 minutes. Lets say you fire 1 round, and lay the pistol down. After 3 minutes, the FRP is noticeable again. Just a guess on time. I have found that one quick spritz of water up the nose of the sparrow with a nasal spray bottle, eliminates the FRP. Also, FRP only happens on a pistol length barrel. There is no FRP on a cold Sparrow with my 10/22 or Savage 64
 
FRP happens when there is oxygen in the can which burns off with the first round. It only comes back after having enough time for the oxygen rich air to infiltrate (there's probably a proper term for that but I don't know it) into the can.

Differently designed internals can have a more or less pronounced FRP, but like in most things there is usually a give and take with the other characteristics of the silencer.

One way you can get rid of FRP is to put a lit match into the end of the silencer. The flame will burn off the oxygen (extinguishing the match) and you'll be good to go.
 
weblance said:
Also, FRP only happens on a pistol length barrel. There is no FRP on a cold Sparrow with my 10/22 or Savage 64
Click to expand...

This is worth pointing out for folks that are looking at these cans and wondering about FRP. I can hear some FRP on my sparrow when it's mounted on a pistol, but it is very consistent shot to shot on all the rifles I've used it on. If you've ever shot a .22 pistol near dusk, it's not hard to figure out why they are so much more prone to FRP.
 
well thanks for the heads up. And it is very good to hear about the lack of FRP on a rifle. But I figure it will mostly be used on a ruger pistol, so I think I may have to look at cans that have minimal FRP. sorry sparrow :(
so that leaves me with what? spectre 2? libery regulator? tacsol axiom?

I of course want that holy grail of cans: super small, super quiet, no FRP, stupid easy to clean, cheap and stellar customer service from a company that will be around forever. Pity it does not exist.
 
I have a Huntertown Arms Guardian 22 Ketsrel core in .22 and have never noticed any difference between round one and any other. Then again, I always have to shoot with hearing protection so it's possible there is a difference and I simply can't hear it.
 
Darkbob nailed it. The pop is a result of oxygen combining with combustion gasses. It goes away after the first round and doesn't return until oxygen has had a chance to infuse back into the suppressor.
 
I have a Sparrow and a Spectre II, and the difference in FRP sound between the two isn't really noticeable. Full disclosure, my hearing is pretty terrible, my wife claims that the FRP on the Spectre is quieter, I have to take her word for it. Like weblance said above, 2-3 minutes is average before you notice it again.
 
Your observation is different than mine on the Surefire. I have a Sparrow and a Ryder and to me the Surefire is quieter, with less FRP.


One can also eliminate FRP by spraying canned aired into the suppressor (like keyboard duster).
 
4thPointOfContact said:
Darkbob nailed it. The pop is a result of oxygen combining with combustion gasses. It goes away after the first round and doesn't return until oxygen has had a chance to infuse back into the suppressor.
Click to expand...
If it is true that FRP is due to there being oxygen in the suppressor to begin with, why is it more noticeable on some suppressors than other suppressors? They ALL start with "oxygenated" internals, but some .22 suppressors have less FRP than others.

Not trying to be a smart-alex, just don't understand why they would be different with respect to FRP when they all start with the same condition.
 
I don't really understand why either, but there is a lot of discussion on the subject at the SilencerTalk forums. There are quite a few professional manufacturers that post regularly there. If I recall correctly, the reason I've read most often has to do with the size of the initial blast chamber coupled with the style of baffles (aka how they disrupt the gas flow). There's a whole lot of science behind suppressor design. There is a bit of give and take with any suppressor design.

IF there were a can that was the shortest, lightest, quietest, cheapest, and longest lasting THEN nobody would buy any other design.
 
Ranger Roberts said:
I have a Sparrow and a Spectre II, and the difference in FRP sound between the two isn't really noticeable. Full disclosure, my hearing is pretty terrible, my wife claims that the FRP on the Spectre is quieter, I have to take her word for it. Like weblance said above, 2-3 minutes is average before you notice it again.
Click to expand...
It is noticeable.

I wouldn't buy a can or not buy based upon any one feature or drawback though.

Same with decibels. If all you value is one thing then chase that but there will be compromises.

On a pistol consider the weight and how it will balance as well.

I like the Spectre II but there are many good options.
 
Its hard to beat the Sparrow. Ease of cleaning is extremely important for a rimfire can, and the Sparrow is one of, if not the best choice, for that. Its small, light, doesn't change the point of impact, and its stainless constructed. Its only drawback is that it does suffer from FRP, but thats easily avoided with a bit of water, or other methods.
 
well right now I am looking at the spectre 2, the axiom, and the liberty regulator, but the regulator is probably too spendy for me.
 
definitely noticeable. I wonder if a bike co2 cartridge would clear out the suppressor to eliminate first round pop.
 
I dont have a suppressor....
If FRP is a problem, id use some "air in a can" (computer duster type stuff) to clear it of oxygen. The stuff is made up mostly of fluorine, and other inert gases that would displace the oxygen.

<deleted>
 
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Frp is so minor on my SS Sparrow that I don't bother with trying to eliminate it. It is only noticeable on a pistol and only the first shot if at all.
 
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