Storing springers - upright or horizontal?

i would never "lean" any gun. store it properly sir.

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I have been shooting springers for over 40 years. My springers never diesel. It absolutely does not matter how you store one. Probably more likely to have unwanted oils from spring grease run down the piston chamber towards the breech seal if stored muzzle down or even slightly down. Excess internal oil is the biggest problem. I keep all my airguns and firearms upright in a humidity controlled gun safe. Rust will do more permanent damage than anything else. Not to mention good safety procedures.
 
If you're going to be storing gas rammed rifles for any length of time, it's a very good idea to store them muzzle down if the ram body is in the rear of the rifle. Gas rams have some silicone inside them to lube the o-rings on the gas ram shaft and stored muzzle down, that silicone migrates away from the shaft end and can cause those o-rings to dry out. 

My spring guns are either stored in wall racks or in soft or hard shell cases. The soft cases keep the butt pad off the floor and padded so I'm not worried they might get deformed.
 
I agree with Bear on storing muzzle down. On factory lubed guns in warm weather you could see some of that spring lube meander it's way down the cylinder wall where it could be picked up by the piston when cocked. I store both my RWS 34 and FWB 124D cased and hung in my closet upright from the clothes hanging dowel. Being I'm in California humidity is of no concern.
 
Thanks all. I'm going to try keeping it upright again. I had a detonation I think last week and that spooked me a bit. It's just so convenient having my front door and back door guns leaning up against the wall next to them. I have some in cases too, but I never take them out because too much of a hassle.

What kind of springer are we talking? 
 
What kind of springer are we talking?

It's a stock HW30s deluxe in .20 cal shooting at 7.1 ft/lb now after it's settled. It surprised me how loud the detonation was for such a low power gun, and also that it happened randomly after almost half tin of pellets. It's made me hesitant to store it upright again because I have no idea what caused it so was trying to check everything off the list. I'm wondering now if it's the pellets being too tight of a fit and harder material (H&N). The 13 grain JSB exacts seems to be having no problem so far... 
 
What kind of springer are we talking?

It's a stock HW30s deluxe in .20 cal shooting at 7.1 ft/lb now after it's settled. It surprised me how loud the detonation was for such a low power gun, and also that it happened randomly after almost half tin of pellets. It's made me hesitant to store it upright again because I have no idea what caused it so was trying to check everything off the list. I'm wondering now if it's the pellets being too tight of a fit and harder material (H&N). The 13 grain JSB exacts seems to be having no problem so far...

It's just excessive lube burning off. Many airgun manufacturers put to much lube in from the factory. Probably to protect the rifle from corrosion if it sits in some humid warehouse.
 
I always store my rifles vertical in my three heated cabinets. Decades ago I installed 1" square wooden strips for the butts to set on. That cured the dreaded dog ear butt pads. It works great. I sand off the two sharp edges on top of the strip, which eliminates any possibility of a mark or indent on the pad.

Here's a pic of one of them.
IMG_20220122_200503553.1642900581.jpg



 
I always store my rifles vertical in my three heated cabinets. Decades ago I installed 1" square wooden strips for the butts to set on. That cured the dreaded dog ear butt pads. It works great. I sand off the two sharp edges on top of the strip, which eliminates any possibility of a mark or indent on the pad.

Here's a pic of one of them.
IMG_20220122_200503553.1642900581.jpg



Those are some beautiful guns!