Figured out a way to shrink / unswell KWA/KSC gbb buckings:

Discussion in 'Gas Powered Guns' started by Automobilie, Apr 22, 2021.

  1. Automobilie

    Automobilie Active Member

    Just about every KWA/KSC gun I've owned has, at one point or another, swelled the bucking with silicone oil. It's a nice, lightweight oil that plays nice with just about every part in a gun except the buckings they use. The problem is that the swelling creates very bad performance and doesn't fit in the gun. for example, the dial adjuster on GBB pistols will pull a swelled bucking with it, while a new bucking will stay in place as the part rotates around it.


    While new ones can be bought for $3.50-$5, it was always a waste to have to throw out an otherwise good bucking just because it got oil on it. I found out that acetone breaks down super glue and wouldn't end up harming silicone RHop patches (At least after a soak or two), so I could glue an entire patch in, messy or not, shave and fit the outside, then drop the barrel in acetone to remove the glue. This had the side effect of also swelling the patch, but after airing out it would return to normal and I'd have a perfect fitting patch that could be tacked back in place.

    Unfortunately, acetone doesn't really remove silicone oil, but a bit of googling says that xylene will, but it'll cause rubber to swell. Had some old swollen buckings and dropped one in a little jar. It swelled, no surprise, but after drying it off and letting it air dry until I could not smell any fumes leaving it, the patch had shrink back to just about new!

    So if anyone wants to confirm this, let me know! But I've tried it on a couple other buckings and so far have had similar results.
    aotsukisho likes this.
  2. Guges Mk3

    Guges Mk3 Administrator Staff Member Administrator Supporting Member Lifetime Supporter

    That means Toluene would work too. Being that both solvents are non-ionic solvents with a benzene ring and methy groups (Toluene has one and xylene has two)...that means it would wick away the Soloxanes (silicone oil) from the substrate. And then the flash point of both solvents being so low it evaporates off and the soloxanes would be left on what ever surface the solvent rested on...yeah...that would in theory work very well for recovering the use of saturated latex packings from KSC/KWA (Yih Kai).

  3. Automobilie

    Automobilie Active Member

    Yep, I just finished running the last of my swelled buckings through it and all are back to factory size, even did the same with a bumper in an ATP.

    I also tried other backings from AEG's and a KJW, but they're not silicone so it didn't seem to have of an effect except removing dirt from them.