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Thread: First round pop

  1. #1
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    First round pop

    I have a shit load of cans and have never noticed any significant FRP.

    Explain the engineering of how it happens, and what cans are most notorious for it?

    PB
    "Air Force / Policeman / Fireman / Man of God / Friend of mine / R.I.P. Steve Lamy"

  2. #2
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    Monocore cans seem to be the most likely to have FRP, and usually it's more noticeable on shorter barrels (pistols vs rifles). The Sparrow and Osprey are two good examples. The Liberty Regulator is advertised to have eliminated it for the most part.

    Has to do with oxygen in the blast chamber.

  3. #3
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    With my sparrow on my 3" buckmark, the pop is noticeable but it's never been loud enough to bother my ears.

  4. #4
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    Quote Originally Posted by BigWaylon View Post
    Monocore cans seem to be the most likely to have FRP, and usually it's more noticeable on shorter barrels (pistols vs rifles). The Sparrow and Osprey are two good examples. The Liberty Regulator is advertised to have eliminated it for the most part.

    Has to do with oxygen in the blast chamber.
    If it's just the size of the blast chamber, why would monocore or not mae a difference? Just curious.

  5. #5
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    First I've heard of FRP. What the heck does it sound like?
    "Every step we take towards making the State our Caretaker of our lives, by that much we move toward making the State our Master." Dwight D. Eisenhower

  6. #6
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    I have a form 1 (semi-home made) 22lr can on a pistol. It has formed freeze plug baffles and tubing spacers of different lengths.

    Originally it had the largest spacer at the rear of the can, creating a large blast chamber, and it had noticeable FRP. Later the spacers were rearranged with a much smaller spacer at the rear, and the biggest spacer at the front. FRP went away and it also seems a touch quieter.

    FRP is just louder than the subsequent shots.
    Last edited by P2000; 12-08-16 at 22:46.

  7. #7
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    Quote Originally Posted by Benito View Post
    If it's just the size of the blast chamber, why would monocore or not mae a difference? Just curious.
    Absolutely no idea.

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    Quote Originally Posted by darr3239 View Post
    First I've heard of FRP. What the heck does it sound like?
    I checked some of the simple videos and had and found two that you can hear it. Neither are a huge difference. There are 5 round unsuppressed in each, then suppressed fire for the rest of the mag. The first shot with each can is louder than the rest. Sometimes it's really noticeable, sometimes it's not.


  9. #9
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    And since it's one video per post, here's the second one:


  10. #10
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    Fireman has a vid of shooting indoors you can hear it distinclty.

    There is O2 in the silencer so the powder burns inside making it louder. After the first shot, enough O2 is consumed that the subsequent shots are a bit quieter. It's noticable on my rev 9, but it's only slight, especially when running wet.

    I'm not sure if it's really louder or just a different tone.

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