Paul Cat Posted June 28, 2018 Report Share Posted June 28, 2018 Evening all. I've a SAK moderator on a CZ 452 using (depending upon which box I grab in the dark) either Eley Subs or Remington. At first I thought I was imagining things or it was coincidence that my first shot of the day was toward a hard backstop but I'm now convinced that the first shot always creates a loud crack, almost as loud as my HMR. Each shot thereafter is as quiet as you would expect. Any ideas? Link to comment Share on other sites More sharing options...
David Hancock Posted June 29, 2018 Report Share Posted June 29, 2018 1 - is it a new mod ? sometimes they need to "bed in". 2 - I sometimes find Remington, and particularly CCI - which I've stopped using are "cracky". The new Eley subs are consistently quiet Link to comment Share on other sites More sharing options...
TattooedGun Posted June 29, 2018 Report Share Posted June 29, 2018 it is known as first round pop (FRP). It is the oxygen burning up inside the moderator on the first shot, following the first shot the moderator chambers are full of carbon dioxide as a result of the burnt gasses, but that additional oxygen present on the first round makes it a more energetic explosion and it can be heard louder. I'm hesitant to post this link as some of the content was contraversial (Using blanks with a moderator as a means of testing efficiency of slowing gasses) however it explains the phenomenon in greater detail - http://blog.stegough.com/moderators-suppressors-first-round-pop/ Hope this helps. Link to comment Share on other sites More sharing options...
Paul Cat Posted July 5, 2018 Author Report Share Posted July 5, 2018 David. It's far from new! Looks as if it's been around the block a few times to be honest. I wondered if a baffle had perhaps come loose but had yet to check that. Then came TattooedGun's reply. Turns out it's a real thing. Thanks TG. Link to comment Share on other sites More sharing options...
Bushytail Posted July 8, 2018 Report Share Posted July 8, 2018 Ive got the same mod, Ive never noticed on mine. Going to listen out now next time to see if I can hear it as well. Never heard of FRP before. Thanksfor the info. Link to comment Share on other sites More sharing options...
Paul Cat Posted July 8, 2018 Author Report Share Posted July 8, 2018 It might be the Remington ammunition. I'll make a note to use Eley next time I go out, see what happens. Link to comment Share on other sites More sharing options...
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