so I was asked the question is it good or bad for a model 10 that was rebuilt 10 years ago to set for long periods of time
and I think the answer is yes and no but here is the problem, it doesn't have any testing done for the answer
would a gun be better off shot once a month vs sitting for a year or two, more than likely but again no proof
again the main problem with the guns being made in the 70's and 80's is they didn't have great material for the synthetic seals but remember the rear sear seals never fail
I have done 7 or 8 model 6's, either 6, 6g or 6m and not one of the rear seals have fail and in some cases i thought about just leaving them but never did
but the cap spacers were always junk and not useable but there one I got out whole, the other were a pain
so why did the fronts turn to just crumbly crap, for one thing, they had more lube on them and the other not so much
but the question then is did the lube destroy the seals or was it just the material, my guess is both
now that brings us to todays seal and that would be seals of 10 years ago, they are not the same material and should last 20 years but again untested
so the question was what happens to the seals setting in a box in storage for 10 years, my guess is very little and they will be fine until they aren't
so is there really an answer, NO, but there are educated assumption and that what we have to go on
the fact that the Model 10 gets over looked is to bad but the Giss system pistols and rifle are some of the best shooting air guns that were every built and most people tend to go over to the FWB's of the time, they were way better selling products, just by the number of pistols and rifles that show up on the used market and great in quality also
so this is just some thought from an owner of both Diana and FWB