i decided on the initial valve internals Ö reprofiled poppet and modified stem with the vintage check valve (pinned to reduce headspace) and the small aluminum spacer. Itíll be middle of the road for valve volume. A lot of good itíll do to have an accurate LW barrel if nothing aligns & the trigger is atrocious. Tach Driver 10s links have some good ideas like epoxy in the clam shells. I m going with shrink tubing on the barrel initially. Trigger spring mods wonít be an issue, but I have to think about the seer engagement and 1rst stage take up. I m not a machinist and just have a drill press and small HF wood lathe. So precision mods to any components are out.
Tweaker enjoy your 760. I was surprised with the accuracy of my 1rst variant 760, using BBs and I kept that bone stock. Details are sometimes vague but https://discover.crosman.com/blog/crosman-product-dates-of-manufacture will give some info on the variants.