GaryM
Super member
I had a Leviathan a few months ago that was returned to the dealer as it was low on power and very inconsistent and the POI would shift constantly, it was replaced with a SMK M22 which has been faultless , nice and consistent and not pellet fussy at all. I missed the feel of the Leviathan it was nice to hold anshoot even though the accuracy was questionable. So I decided to get another one, luckily Just Airguns had them on offer for £230 plus delivery, one was duly ordered and arrived a few days later in .22 flavour. This was put over the chrono and returned a very consistent 9.8fpe and was accurate, yes a little low on power as this is my pest dispatching gun.
So what to do? I know lets void the warranty and remove the anti tampers, strip out the hammer spring and see what can be done with it. Whilst tinkering I also removed the anti tampers that held the plate over the adjustable regulator so that is now accessible. A few tweaks were made and its now shooting at 11.6fpe and the regulator has been turned down slightly. Obviously I cant discuss the mods that have been made but the manufacturer has gone to town with anti tampers which makes it difficult to replace any seals they supply with the gun but with some perseverance it can be done.
The next step was just to make the gun feel a little nicer, now its got the synthetic stock which is more of a hard squeaky groaning hollow plastic feel, I know lets get some Dynamat and cover the inside of the but and stock parts, so this has been done, What a difference yes its slightly heavier but not much , but and its a big but the feel has been changed to that of a less squeaky groan from the stock to one with a solid dull thud when tapped. So there are a few other improvements I've made such as a second barrel band just to stop the barrel from moving should it get clouted when in a barn and the addition of some barrel supports inside the shroud purely due to the fact the barrel is only 10mm in diameter and doesn't have a crown so to maintain accuracy in case of a knock. I previously purchased one of the Donnay barrel/silencer adapters for this gun so that's been fitted now, there are a few other improvements I would like to make but details of them will follow when made later, for the time being here is a couple of photos.
So what to do? I know lets void the warranty and remove the anti tampers, strip out the hammer spring and see what can be done with it. Whilst tinkering I also removed the anti tampers that held the plate over the adjustable regulator so that is now accessible. A few tweaks were made and its now shooting at 11.6fpe and the regulator has been turned down slightly. Obviously I cant discuss the mods that have been made but the manufacturer has gone to town with anti tampers which makes it difficult to replace any seals they supply with the gun but with some perseverance it can be done.
The next step was just to make the gun feel a little nicer, now its got the synthetic stock which is more of a hard squeaky groaning hollow plastic feel, I know lets get some Dynamat and cover the inside of the but and stock parts, so this has been done, What a difference yes its slightly heavier but not much , but and its a big but the feel has been changed to that of a less squeaky groan from the stock to one with a solid dull thud when tapped. So there are a few other improvements I've made such as a second barrel band just to stop the barrel from moving should it get clouted when in a barn and the addition of some barrel supports inside the shroud purely due to the fact the barrel is only 10mm in diameter and doesn't have a crown so to maintain accuracy in case of a knock. I previously purchased one of the Donnay barrel/silencer adapters for this gun so that's been fitted now, there are a few other improvements I would like to make but details of them will follow when made later, for the time being here is a couple of photos.
a common trait shared with quite a few high end rifles.
) LOL 
