Had these 2 apart yesterday, mainly to see if this new Konceptus tuning kit for the Lucznik will fit the Walther.
It will not but I noted that the Lucznik has a greater volume/stroke owing to a shorter piston. However, its of interest that the 2 guns produce similar power when in good order. The std Lucznik produced 380 fps and the Walther 375 fps with Hobby pellets. Both guns with new piston heads and good springs.
The reason appears to be that any slight differences in volume/stroke makes little difference at this size which should provide useful information to anyone planning to modify their guns strokes or piston lengths.
However, there does appear huge benefit to this kit which relies on using one spring.
The key here is not stroke/volume but one powerful spring equal to the usual 2 fitted but then allowing the use of correct guide rodding instead of the inner spring as guide rod. The inner spring as a guide is a bad idea really, producing vibration and lots of friction points as the coils pass over each other. The kit which uses delrin guide rods and a piston weight pushes the Lucznik upto 470 fps with no twang but the maker claims upto 500fps with some pellets.
Im now trying to work out how to fit such a kit to the Walther. Ill get back to you if I do any good.