Cheers for the comments lads. Jsr, I know it's huge

. I might take off the gun style blowgun and take the fitting tee, stick it straight on the back and use a normal blow gun. This should all make the pilot alot smaller.
But ehhhh, this blowgun and filler is to be used on my next gun thats got a pretty beefy chamber on it so I might just persist for now

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I'm surprised that even so it's got a huuuge pilot, it works well still
