The Rifle.

The rifle is a 1992 0.22 Cal Diana 34 that I decided was too long for my liking (too long for any of my rifle bags as well). That inspired me to do a radical barrel chop as well as a full tune and service.
Initially the rifle was so under-sprung that I could cock it with my right hand holding the barrel but touching the front of the breach block. The spring fitted after the barrel was cut is a little stiffer but with the extra leverage provided by the shroud cocking effort is entirely acceptable.

Work Done.

Stock.

Refinished stained and oiled.
White spacer and Vulcanite but pad added.

Barrel.

Cut to about 8” including the section in the breach block.
Re-crowned (2).
Made a custom shroud, with simple baffle, extending 6” beyond the muzzle.

After the barrel was cut down to 8" the rifles firing cycle was very harsh, this was resolved by restricting the transfer port and fitting a slightly stiffer spring to compensate for the resulting reduction in MV.

Action.

Re-sprung, Maccari seal + stick on buttons fitted.
Delrin “Top Hat” made to fit.
Usual polishing and de-burring.
Using a Bras insert I made the Transfer port (1) was reduced to 0.118“ (0.3mm) from about 0.157” (4 mm).
The Brass insert is held in place with Red Locktight.
The mainspring is a shortened HW80 spring.

Note. I had to use a grindstone on the piston skirt, the skirt was almost perfectly round but the receiver was a little out.

In use.

Currently running under the UK limit at about 11.4 FPE.
The firing cycle is smooth with linear recoil, no twisting.
Cocking - cocking is now smooth and noise free.

Group Shot at Rivington Riflemens indoor range.

group

1 Shot to mark the card and use as an aiming point followed by a 5 Shot Group.

Thanks to:-

1,   Edward Krzynowek for advice about the transfer port sizing.
2,     Dmitry Smushkov for machining advice.
3,     Jim Edge for the machining I could not manage.
4,     Pock for springs.

Airguns And Airgun DIY.

Diana 34 Project.