You seem to be assuming that the pressures touching piston/cylinder from the Delrin bearings and the metal bell bearing are the same but a precisely machined and hand finished piston and a central piston rod would hardly touch the moly lubed cylinder so even if plastic has less friction there would be still be more friction because the plastic rings would be touching with a even pressure all through the piston stroke, thats why precision made metal parts have less friction in a springer but would cost a more so it is much more easy to manufacture pistons with rings as they can hide any small faults and look like out of the box tuned guns. And metal parts look better when you dismantle your gun
and will last a lifetime unlike plastic parts
Are you sure that you have posted a picture of two German pistons and not Bulgarian
Originally Posted by Barryg
You seem to be assuming that the pressures touching piston/cylinder from the Delrin bearings and the metal bell bearing are the same but a precisely machined and hand finished piston and a central piston rod would hardly touch the moly lubed cylinder so even if plastic has less friction there would be still be more friction because the plastic rings would be touching with a even pressure all through the piston stroke, thats why precision made metal parts have less friction in a springer but would cost a more so it is much more easy to manufacture pistons with rings as they can hide any small faults and look like out of the box tuned guns. And metal parts look better when you dismantle your gun
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