Diana Diana 30 won't cock.

When I bought these rifles NOS, they worked fine, I fired three shots from each and put them in the safe for a couple of years. Now I took them out and both rifles won't cock, the bolts won't even move. What could this be?

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nice rifles
the parts diagram shows they use synthetic seals which is good but the size i am not sure
Knibbs Chambers show no parts Waffencenter Gotha does in Germany
i looked at the parts diagram and i must say it is damn busy as in lot of parts
my guess is the piston seal has degraded and it is stuck and that might be no fun
they made these from 1972 till 2000 says the Blue Book
so i believe you or someone will be rebuilding these before they shoot their round balls again
well good luck i would have to do some more research on the piston seal size it is not the common 28mm
so after doing some digging the seal is the same seal as the ones used the Diana pistols
and that will help in finding them i would want a blue one they will be easier to install the red tend to be over sized
that is all from me
https://www.semschietsport.nl/en/diana-piston-seal-30105100.html

https://www.waffencenter-gotha.de/shop/DIANA:.:2.html?filter_id=264
https://www.pyramydair.com/blog/202...KqsSlD2mWIsp8zzr1HlPDXz4aD-pPBSAQh6c2eq-GXHWq
DIANA MODEL 30.jpg
 
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Both rifles started to cock, but after a couple of shots the barrels got clogged, probably with scraps of cuffs or old grease, now it's definitely a dead end. I tried to wash the WD40, clean it with a cleaning rod, blow with compressed air, all to no avail.
Your barrels are almost certainly clogged with the remnants of the original synthetic seals that have deteriorated over time. Your best bet is to take them apart and replace the seals.
 
@ levgen721.-

Please don't take this the wrong way, but what ammunition did you load into your D30's?

A bit of history:
These guns have been Out of Production for at least 10 years.
Still, when this version came out (at least two variations I am aware of), it already had the blue silicon rubber seal that is the standard for all DIANA piston seals.
So the seals were not the problem. Using WD-40 may have changed that, but these blue seals do NOT disintegrate as the old Nylon seals of the Giss action'ed models 50 to 75.

These guns were made for Shooting Stand Operators in Germany, where there are yearly "fairs" at churches. Each church has a Patron Saint, and around the week where the date dedicated to the Patron Saint comes around, there will be a fair in the town square (usually you have the Town Hall, the Courts and the Church on three sides of the square). Since Church in German is "Kirk" and Fair in German is "Messe", these events were known since the Middle Ages as "KirkMesse", the original word behind the "Kirmes/Kirmessen" and the English version: "Kermesse"

They were NEVER intended for final users.
They are complicated because they need to keep a resettable counter (you pay according to the number of shots taken), and a non-resettable counter, so that the owner could monitor the operator, or take heed when the gun needed to be returned to the factory for service.
Again, it was NEVER intended for the gun to be user serviceable.
They were practically hand made and fitted, and they DID indeed had a very high price. The modern/current version, the NEO 30 is all CNC machined and costs over €1,400 in Europe. Again, not intended for end users.

The rifles usually came with a red and grey Loader, that put all the 125 "rundkugeln" or RK (it would be a mistake to call them "BB"s) easily.
Barrels were made to exacting specs of 4.40 mm's Groove Diameter. Rifling is VERY shallow, but enough to be accurate out to 7 meters (21 ft).
Targets were clay stars that hung from a metal plate and so, lead RK were exclusively used.
IF you busted 10 stars you get a fluffly/stuffy/cuddly toy for your date.

H&N made these RK by the millions. And still does, but it does NOT sell to end users.
You CAN get them from some distributors under the DIANA brand:
These rifles should NEVER be loaded with steel BB's, not even the Premium brand specced at 0.172"

Because the feeding system is complicated, out of round, or out of caliber ammo generated problems. Savvy operators knew this and stuck to quality ammo. After all, the savings in the ammo would not justify the stoppage of the operation/business.

I had two of these and enjoyed them immensely, within their range they are accurate enough.
Depending on what you loaded them with, the fix may be easy or not.
In any case, you will need to get them serviced/repaired, and the parts for the older version are not easily available.

Sorry for your mishap.

Keep well and shoot straight!








HM
 
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