24 to 350M uses 8mm ID x 13mm OD x 2.5mm
P5 pistol uses 7mm ID x 11mm OD x 2.5mm
A 1/4" ID x 7/16" OD x 3/32" will work on the pistol - I
know that for a fact.
On all there will most likely be metal shim(s) under o-ring.
You may or may not need to add shim(s).
A 'healthy' P5 Magnum .177 should clock/chrony at 540-550 fps
MV with CPLs and 570-580 fps MV with RWS Hobbies. Many are
weak because they need a new breech seal and/or shimmed.
No doubt many springers new and old/used are leaking at the
breech seal.Usually such an easy and cheap fix!
Herb
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