Confused myself, thick ret hid the target so went for thin ret, that got lost looking at the target. Very hard to get to perfection trying different...
Just adding some delrin thrust washers as well, I do have the black lubricant tube out of the piston at the moment and the weights are normally under...
Welcome Kev, you might find a front sight on fleabay. Failing that you might want to consider a telescopic sight, which is what most rifles use these...