Just to give another perspective and NOT to argue any agenda...1. I only ever cleaned every "new" air rifle barrel, when I got it home from its purchase. After that,, well there's no "after that". I never cleaned any air rifle barrel ever again. Sometimes even after hundreds or even thousands of shots, they seem to still shoot well - for me anyway...2. I work on the theory that all (coil) springs created with equal planning. If they have to stretch or compress, as soon as you take off that pressure, they will always want to return to their original free standing shape or size as quickly as possbile. That's their nature by design. Keeping the pressure on them will slowly but surely degrade their ability to do so. The idea is to not keep that pressure on them for the most time,, and to do so only "when needed". You should cock that spring only when you are ready to fire or foresee that readiness, in the immediate future. Myself, if I cocked my Diana 350 (which I do have, and in .22 - too), but didn't fire it for more than about half a minute or so, I'd surely uncock it, partially for the above reasons and partially for the safety aspect...There's an old saying which I just made up - If you don't like the answer,, don't ask the question...Just kidding..!!But you DID ask, didn't you,, and I answered...!!Cheers Dave.. The Diana 350 is a great rifle,, I think. I haven't even sighted mine in yet - hahahaha. One day I will get around to it - I think..!! Let us know how you get on with yours...