AirGunTech: Re Engineering Spring Powered Air Rifles for smoothness, consistency, and to better suit UK power levels.

Diana 280 piston, where to correct if nose is out of round.

Decided to pick up another D280, this one is .177 and full rifle, the extra barrel length really helps the gun IMO….if you want the K version get a .22. So….again i checked the piston and again it was rubbing on the compression cylinder just behind the piston nose…so I figured I would show some pics of where to file a little off the piston if you do not have access to a lathe. Of course I machined my piston here on the lathe but this could be done by hand.

So the pics…:


IMG_4673 IMG_4675 IMG_4674









As you see its between the crimps, this is where the steel was bulging a little and could possibly rub on the compression cylinder. Not all pistons are bad, my first .177 was way worse than this one, so its worth checking while you are tuning the gun.


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