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Gamo Cf20 Or 30 Barrel ??

Discussion in 'Technical' started by ajohn, Sep 14, 2021.

  1. ajohn

    ajohn Chewing Things Over

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    Does anyone know if these can be removed ? A clue might help if it is possible.

    The gun uses a pellet tap and I suspect the barrel bore is a bit oversized where the pellet eventually goes in and want to look at shortening it ;) or at least measuring it. Bit tricky with it in place.
     
  2. TheKiwi

    TheKiwi Band member

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    I don't know if the 20/30 is the same but the CFX barrel screws in.

    Take the rear sight off and look into the front hole. On my CFX I can see the barrel threads at the bottom.
     
  3. hmangphilly

    hmangphilly Big Poster

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    The bore will have to be oversized/tapered to allow the pellet to transition from the tap to the barrel.
    the pellet is being fired from / seated in the tap not the barrel

    It's a poor system but it feels satisfying to open and close the mechanics
     
  4. ajohn

    ajohn Chewing Things Over

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    Thanks. I'll have look at that. i have a bore scope of sorts and the brass sleeve rim in the tap can clearly be seen but no way to size if it's the barrel or the size of the hole in the tap. The tap may be sizing the pellets but I don't think so.

    A pellet with a softer skirt gives an extra fpe or so over JSB's. I spent some time with power washers and they made little difference and then tried some BSA Elites as I had some - then things made sense. 11.5fpe, no power washers and standard parts. 10fpe with JSB express that wouldn't really shift. The elites aren't very good pellets though so odd ones are overtight etc.

    The plastic bung, end of cylinder behind the tap actually relaxed pressure on the tap when the gun is cocked. Or should say did until I fitted a new one that appears to be a bit out of round so doesn't move so easily. Big mistake on the original one, tapered the port in it a little and that messed things up. Same thing happens with the new bung but not so well.
     

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